diff --git a/src/main/java/org/apache/commons/validator/routines/BigIntegerValidator.java b/src/main/java/org/apache/commons/validator/routines/BigIntegerValidator.java
index 27c44735f..1642d66cc 100644
--- a/src/main/java/org/apache/commons/validator/routines/BigIntegerValidator.java
+++ b/src/main/java/org/apache/commons/validator/routines/BigIntegerValidator.java
@@ -16,6 +16,7 @@
  */
 package org.apache.commons.validator.routines;
 
+import java.math.BigDecimal;
 import java.math.BigInteger;
 import java.text.Format;
 import java.text.NumberFormat;
@@ -120,7 +121,7 @@ public BigIntegerValidator(final boolean strict, final int formatType) {
      *         specified range.
      */
     public boolean isInRange(final BigInteger value, final long min, final long max) {
-        return value.longValue() >= min && value.longValue() <= max;
+        return value.compareTo(BigInteger.valueOf(min)) >= 0 && value.compareTo(BigInteger.valueOf(max)) <= 0;
     }
 
     /**
@@ -132,7 +133,7 @@ public boolean isInRange(final BigInteger value, final long min, final long max)
      *         or equal to the maximum.
      */
     public boolean maxValue(final BigInteger value, final long max) {
-        return value.longValue() <= max;
+        return value.compareTo(BigInteger.valueOf(max)) <= 0;
     }
 
     /**
@@ -157,7 +158,14 @@ public boolean minValue(final BigInteger value, final long min) {
      */
     @Override
     protected Object processParsedValue(final Object value, final Format formatter) {
-        return BigInteger.valueOf(((Number) value).longValue());
+        if (value instanceof Long) {
+            return BigInteger.valueOf(((Long) value).longValue());
+        }
+        if (value instanceof Double) {
+            // No need to roundtrip with a string.
+            return BigDecimal.valueOf(((Double) value).doubleValue()).toBigInteger();
+        }
+        return new BigDecimal(value.toString()).toBigInteger();
     }
 
     /**
diff --git a/src/test/java/org/apache/commons/validator/routines/BigIntegerValidatorTest.java b/src/test/java/org/apache/commons/validator/routines/BigIntegerValidatorTest.java
index 8c2416d12..53ab62631 100644
--- a/src/test/java/org/apache/commons/validator/routines/BigIntegerValidatorTest.java
+++ b/src/test/java/org/apache/commons/validator/routines/BigIntegerValidatorTest.java
@@ -70,6 +70,50 @@ protected void setUp() {
 
     }
 
+    /**
+     * Test a value larger than {@link Long#MAX_VALUE} keeps its magnitude instead of being clamped to {@link Long#MAX_VALUE}.
+     */
+    @Test
+    void testBigIntegerAboveLongMaxValue() {
+        // One past Long.MAX_VALUE, so NumberFormat parses it as a Double rather than a Long.
+        final BigInteger aboveLong = BigInteger.valueOf(Long.MAX_VALUE).add(BigInteger.ONE);
+        final String aboveLongStr = aboveLong.toString();
+        final BigIntegerValidator instance = BigIntegerValidator.getInstance();
+        final BigInteger resultAboveLong = instance.validate(aboveLongStr, "#");
+        assertTrue(resultAboveLong.compareTo(BigInteger.valueOf(Long.MIN_VALUE)) > 0);
+        assertTrue(resultAboveLong.compareTo(BigInteger.ZERO) > 0);
+        assertTrue(resultAboveLong.compareTo(BigInteger.valueOf(Long.MAX_VALUE)) > 0);
+        assertTrue(instance.minValue(resultAboveLong, Long.MIN_VALUE));
+        assertFalse(instance.minValue(resultAboveLong, Long.MAX_VALUE));
+        assertFalse(instance.maxValue(resultAboveLong, Long.MIN_VALUE));
+        assertFalse(instance.maxValue(resultAboveLong, Long.MAX_VALUE));
+        assertFalse(instance.isInRange(resultAboveLong, Long.MIN_VALUE, Long.MAX_VALUE));
+        // BigDecimalValidator already preserves the magnitude, so the two must agree
+        assertEquals(BigDecimalValidator.getInstance().validate(aboveLongStr, "#").toBigInteger(), resultAboveLong);
+    }
+
+    /**
+     * Test a value larger than {@link Long#MAX_VALUE} keeps its magnitude instead of being clamped to {@link Long#MAX_VALUE}.
+     */
+    @Test
+    void testBigIntegerBelowLongMinValue() {
+        // One past Long.MAX_VALUE, so NumberFormat parses it as a Double rather than a Long.
+        final BigInteger belowLong = BigInteger.valueOf(Long.MIN_VALUE).subtract(BigInteger.ONE);
+        final String belowLongStr = belowLong.toString();
+        final BigIntegerValidator instance = BigIntegerValidator.getInstance();
+        final BigInteger resultBelowLong = instance.validate(belowLongStr, "#");
+        assertTrue(resultBelowLong.compareTo(BigInteger.valueOf(Long.MIN_VALUE)) < 0);
+        assertTrue(resultBelowLong.compareTo(BigInteger.ZERO) < 0);
+        assertTrue(resultBelowLong.compareTo(BigInteger.valueOf(Long.MAX_VALUE)) < 0);
+        assertTrue(instance.minValue(resultBelowLong, Long.MIN_VALUE));
+        assertFalse(instance.minValue(resultBelowLong, Long.MAX_VALUE));
+        assertTrue(instance.maxValue(resultBelowLong, Long.MIN_VALUE));
+        assertTrue(instance.maxValue(resultBelowLong, Long.MAX_VALUE));
+        assertFalse(instance.isInRange(resultBelowLong, Long.MIN_VALUE, Long.MAX_VALUE));
+        // BigDecimalValidator already preserves the magnitude, so the two must agree
+        assertEquals(BigDecimalValidator.getInstance().validate(belowLongStr, "#").toBigInteger(), resultBelowLong);
+    }
+
     /**
      * Test BigInteger Range/Min/Max
      */