65536

This number is a composite.

+ The largest known number such that its sum of unitary divisors is prime. A divisor d of n is said unitary if gcd(d, n/d) = 1. Note that this number is a Fermat prime minus one. [Russo]

Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell