For other situations like a CRC on an arbitrarily-sized message, a big int would be better, surely? You can do long division on those. https://ziglang.org/documentation/0.16.0/std/#std.math.big.i...

I was talking about GP's u729, which is 9*9*9, the state space of a sudoku board. Can you come up with a situation where dividing that number by anything is meaningful?