diff --git a/ClosedXML/Excel/Cells/XLCell.cs b/ClosedXML/Excel/Cells/XLCell.cs
index ff402de..7cdb089 100644
--- a/ClosedXML/Excel/Cells/XLCell.cs
+++ b/ClosedXML/Excel/Cells/XLCell.cs
@@ -1883,7 +1883,7 @@
             else if (value is DateTime)
                 val = ((DateTime)value).ToString("o");
             else if (value.IsNumber())
-                val = Convert.ToDecimal(value).ToInvariantString();
+                val = value.ToInvariantString();
             else
                 val = value.ToString();
             _richText = null;
diff --git a/ClosedXML/Extensions.cs b/ClosedXML/Extensions.cs
index 19d108d..8836f26 100644
--- a/ClosedXML/Extensions.cs
+++ b/ClosedXML/Extensions.cs
@@ -351,5 +351,33 @@
                     || value is double
                     || value is decimal;
         }
+
+        public static string ToInvariantString(this object value)
+        {
+            if (value is sbyte)
+                return ((sbyte)value).ToString(CultureInfo.InvariantCulture);
+            else if (value is byte)
+                return ((byte)value).ToString(CultureInfo.InvariantCulture);
+            else if (value is short)
+                return ((short)value).ToString(CultureInfo.InvariantCulture);
+            else if (value is ushort)
+                return ((ushort)value).ToString(CultureInfo.InvariantCulture);
+            else if (value is int)
+                return ((int)value).ToString(CultureInfo.InvariantCulture);
+            else if (value is uint)
+                return ((uint)value).ToString(CultureInfo.InvariantCulture);
+            else if (value is long)
+                return ((long)value).ToString(CultureInfo.InvariantCulture);
+            else if (value is ulong)
+                return ((ulong)value).ToString(CultureInfo.InvariantCulture);
+            else if (value is float)
+                return ((float)value).ToString(CultureInfo.InvariantCulture);
+            else if (value is double)
+                return ((double)value).ToString(CultureInfo.InvariantCulture);
+            else if (value is decimal)
+                return ((decimal)value).ToString(CultureInfo.InvariantCulture);
+            else
+                return value.ToString();
+        }
     }
 }
diff --git a/ClosedXML_Examples/Misc/DataTypes.cs b/ClosedXML_Examples/Misc/DataTypes.cs
index e50b3ba..0e2e356 100644
--- a/ClosedXML_Examples/Misc/DataTypes.cs
+++ b/ClosedXML_Examples/Misc/DataTypes.cs
@@ -77,6 +77,9 @@
             ws.Cell(++ro, co).Value = "Double Number:";
             ws.Cell(ro, co + 1).Value = 123.45d;
 
+            ws.Cell(++ro, co).Value = "Large Double Number:";
+            ws.Cell(ro, co + 1).Value = 9.999E307d;
+
             ro++;
 
             ws.Cell(++ro, co).Value = "Explicit Text:";
diff --git a/ClosedXML_Tests/Resource/Examples/Misc/DataTypes.xlsx b/ClosedXML_Tests/Resource/Examples/Misc/DataTypes.xlsx
index 7b3e5a2..f33318d 100644
--- a/ClosedXML_Tests/Resource/Examples/Misc/DataTypes.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/Misc/DataTypes.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/Misc/DataTypesUnderDifferentCulture.xlsx b/ClosedXML_Tests/Resource/Examples/Misc/DataTypesUnderDifferentCulture.xlsx
index e86beba..f3bf2bf 100644
--- a/ClosedXML_Tests/Resource/Examples/Misc/DataTypesUnderDifferentCulture.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/Misc/DataTypesUnderDifferentCulture.xlsx
Binary files differ