A better solution would be to update the game. As somebody mentioned, they are likely using a 32bit integer so the range is indeed up to about 2 billion. There is no reason for this limitation, other than nobody has bothered to change it to a 64bit integer, which has a range of -9223372036854775808 to 9223372036854775807.
There is nothing difficult about this, and it is frustrating to see replies like yours where you seem to be actively encouraging SI to NOT improve the game.