Cannot calculate factorials bigger than 20! ! How to do so?

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The limit on an unsigned long long is 18446744073709551615, or about 1.8e+19. 20! is about 2.4e+18, so within range, however 21! is about 5.1e+19, exceeding the maximum size of an unsigned long long.

You may find this helpful: Are there types bigger than long long int in C++?

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