I have used 128 bit (and even 256 bit) numbers during Advent of Code when I was too lazy to optimize my algorithm and found that the puzzle input didn't exceed

I have used 128 bit (and even 256 bit) numbers during Advent of Code when I was too lazy to optimize my algorithm and found that the puzzle input didn't exceed the 64 bit space by enough to look into arbitrary sized integers or better algorithmic solutions. There are also some data formats that are 128 bit, like others mentioned.