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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
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Nobody forbids you to give a solution with big integers, who can do more can do less!-)
The kata is made unique for different languages. Python, Ruby, Clojure supports big integers without further ado. In C# you can use big integers too.
https://msdn.microsoft.com/fr-fr/library/system.numerics.biginteger%28v=vs.110%29.aspx
Where does this big number come from? In C# long are sufficient to pass the tests.