Calculation of numbers bigger than "unsigned long long"?

Question

[C] So I've been using unsigned long long for my base 62 converter but it looks like it can only properly take 14 digit numbers. Is there ways to intake more digit number(atleast 30). I tried arrays but it seems like division is pretty complex in digits in array compared to multiplication.

Answer 1

Working with large numbers:
https://www.quora.com/Can-C-programming-language-deal-with-large-numbers

Which references this library:
https://gmplib.org/