In C# int is a shorthand reference to Int32 - a
32 bit integer[
^], which have the range of -2,147,483,648 to 2,147,483,647...Your value is way out of this...
Try using Int64 (long). It have much larger range...
If you need more and no negative values used you can try UInt64 (ulong) or for really large numbers (with negative values) Decimal (decimal)...