Failing Edge Test Case 6

My Edge test case 6 is failing, I tried many things but still unable to resolve the error. Any hints?

Check for 2^50 - 1.

When I am checking for the input 2^50 - 1, it’s giving the output.

No Number

it’s correct or wrong.

Yes, that’s correct. Check for this. 72057594037927935

Output should be

No Number

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