Using 64-bit integers as a count of a hundredth or of a thousandth part of a cent should be enough for most purposes (i.e. up to ten thousand or one hundred thousand billions of $).
If you want to be able to count trillions of trillions of dollars with a resolution of a millionth part of a cent, then you can use 128-bit integers.
Computing exactly with 128-bit integers is many times faster than computing only approximately with decimal floating-point numbers and it requires less memory storage for the same dynamic range.
If you want to be able to count trillions of trillions of dollars with a resolution of a millionth part of a cent, then you can use 128-bit integers.
Computing exactly with 128-bit integers is many times faster than computing only approximately with decimal floating-point numbers and it requires less memory storage for the same dynamic range.