看看 BigInteger ，请参阅此处的示例： BigInteger Struct（System.Numerics）| Microsoft Docs [ ^ ]



另请参阅此CodeProject示例：计算C＃中整数的因子 [ ^ ]

Take a look at BigInteger, see examples here: BigInteger Struct (System.Numerics) | Microsoft Docs[^]

Also see this CodeProject example: Calculate the Factorial of an Integer in C#[^]