diff --git a/src/Humanizer.Tests.Shared/Localisation/nl/NumberToWordsTests.cs b/src/Humanizer.Tests.Shared/Localisation/nl/NumberToWordsTests.cs
index 4df6a1caf..69e58d247 100644
--- a/src/Humanizer.Tests.Shared/Localisation/nl/NumberToWordsTests.cs
+++ b/src/Humanizer.Tests.Shared/Localisation/nl/NumberToWordsTests.cs
@@ -46,7 +46,20 @@ public class NumberToWordsTests
         [InlineData(415618, "vierhonderdvijftienduizend zeshonderdachttien")]
         [InlineData(16415618, "zestien miljoen vierhonderdvijftienduizend zeshonderdachttien")]
         [InlineData(322, "driehonderdtweeëntwintig")]
-        public void ToWords(int number, string expected)
+        public void IntToWords(int number, string expected)
+        {
+            Assert.Equal(expected, number.ToWords());
+        }
+
+        [Theory]
+        [InlineData(100_000_000_000L, "honderd miljard")]
+        [InlineData(1_000_000_000_000L, "een biljoen")]
+        [InlineData(100_000_000_000_000L, "honderd biljoen")]
+        [InlineData(1_000_000_000_000_000L, "een biljard")]
+        [InlineData(100_000_000_000_000_000L, "honderd biljard")]
+        [InlineData(1_000_000_000_000_000_000L, "een triljoen")]
+        [InlineData(9_223_372_036_854_775_807L, "negen triljoen tweehonderddrieëntwintig biljard driehonderdtweeënzeventig biljoen zesendertig miljard achthonderdvierenvijftig miljoen zevenhonderdvijfenzeventigduizend achthonderdzeven")]
+        public void LongToWords(long number, string expected)
         {
             Assert.Equal(expected, number.ToWords());
         }
diff --git a/src/Humanizer/Localisation/NumberToWords/DutchNumberToWordsConverter.cs b/src/Humanizer/Localisation/NumberToWords/DutchNumberToWordsConverter.cs
index 75b89f828..67b3a15df 100644
--- a/src/Humanizer/Localisation/NumberToWords/DutchNumberToWordsConverter.cs
+++ b/src/Humanizer/Localisation/NumberToWords/DutchNumberToWordsConverter.cs
@@ -17,7 +17,7 @@ internal class DutchNumberToWordsConverter : GenderlessNumberToWordsConverter
 
         private class Fact
         {
-            public int Value { get; set; }
+            public long Value { get; set; }
             public string Name { get; set; }
             public string Prefix { get; set; }
             public string Postfix { get; set; }
@@ -26,19 +26,18 @@ private class Fact
 
         private static readonly Fact[] Hunderds =
         {
-            new Fact {Value = 1000000000, Name = "miljard", Prefix = " ", Postfix = " ", DisplayOneUnit = true},
-            new Fact {Value = 1000000,    Name = "miljoen", Prefix = " ", Postfix = " ", DisplayOneUnit = true},
-            new Fact {Value = 1000,       Name = "duizend", Prefix = "",  Postfix = " ", DisplayOneUnit = false},
-            new Fact {Value = 100,        Name = "honderd", Prefix = "",  Postfix = "",  DisplayOneUnit = false}
+            new Fact {Value = 1_000_000_000_000_000_000L, Name = "triljoen", Prefix = " ", Postfix = " ", DisplayOneUnit = true},
+            new Fact {Value = 1_000_000_000_000_000L,     Name = "biljard", Prefix = " ", Postfix = " ", DisplayOneUnit = true},
+            new Fact {Value = 1_000_000_000_000L,         Name = "biljoen", Prefix = " ", Postfix = " ", DisplayOneUnit = true},
+            new Fact {Value = 1000000000,                 Name = "miljard", Prefix = " ", Postfix = " ", DisplayOneUnit = true},
+            new Fact {Value = 1000000,                    Name = "miljoen", Prefix = " ", Postfix = " ", DisplayOneUnit = true},
+            new Fact {Value = 1000,                       Name = "duizend", Prefix = "",  Postfix = " ", DisplayOneUnit = false},
+            new Fact {Value = 100,                        Name = "honderd", Prefix = "",  Postfix = "",  DisplayOneUnit = false}
         };
 
         public override string Convert(long input)
         {
-            if (input > Int32.MaxValue || input < Int32.MinValue)
-            {
-                throw new NotImplementedException();
-            }
-            var number = (int)input;
+            var number = input;
 
             if (number == 0)
             {
@@ -133,4 +132,4 @@ public override string ConvertToOrdinal(int number)
             return word + "de";
         }
     }
-}
\ No newline at end of file
+}