An integer constant was too large

Q: 99999999999999999999
E: An integer constant was too large.

There is a limit on the magnitude of integer constants. As of version 6.0, an integer constant can’t have a value greater than 2^64-1. Also, if an integer in an expression has a value between 2^63 and 2^64-1 inclusive, the error "Singular expression refers to nonexistent object" will be thrown.