6561101970383
This number is a composite.
656 1101970383
Single Curio View: (Seek other curios for this number)
The semiprime 6561101970383 is the only known
counterexample to
Kamenetsky's formula for finding the number of digits
in the factorial of any number. [Gudipati]
Submitted: 2026-11-06 04:05:46; Last Modified: 2026-11-06 04:19:58.
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