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bignum - How can I represent a very large integer in .NET?

Does .NET come with a class capable of representing extremely large integers, such as 100 factorial? If not, what are some good third party libraries to accomplish this?

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.NET 4 has a BigInteger class

Represents an arbitrarily large signed integer.

The BigInteger type is an immutable type that represents an arbitrarily large integer whose value in theory has no upper or lower bounds. This type differs from the other integral types in the .NET Framework, which have a range indicated by their MinValue and MaxValue properties.


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