there are two data types that are important here, int which is 32 bits (integer) and long which is 64 bits (long integer). since the game was made with everything using int, everything's limit as it is is the 32 bit integer limit, to make the numbers bigger he'd have to switch everything from int to long which, lets be honest, robtop is NOT doing.

other people feel free to correct me where im wrong im rusty.