Like qbrass already pointed out, the largest prime number isn't "very large" by file standards - it'd be about 10 megabytes. If you can compute with the number

Like qbrass already pointed out, the largest prime number isn't "very large" by file standards - it'd be about 10 megabytes. If you can compute with the number, you can send whatever shape you keep it in to compute. OTOH, actual "very large numbers" like Graham's number can't be computed with meaningfully - writing down even one of the _earlier_ terms in that sequence would need more digits than there are Planck volumes in the universe.