Thread: Possible Anomaly of the Fermat Euler Function

I am slightly confused by the following:
Fact: 54410972897 is a prime. Set p = 54410972897.
560 is the least power of 2 such that 2⁵⁶⁰ = 1 (mod. p). [2²⁸⁰ = -1 (mod. p).]
So, according to Euler 560 should divide p-1 but it does not.

Can anyone give a correction to this?

by my calculations 2¹¹² = 1 (mod 54410972897).

note that 112 divides both 560 and 544109728896.

Solved