This number is a composite.
6560 = 2^5 * 5 * 41 is the smallest integer n where n and n+1 (6561 = 3^8) are both products of 7 or more primes. [Post]
6560 = 2^5 * 5 * 41 is the smallest integer n where n and
n+1 (6561 = 3^8) are both products of 7 or more primes. [Post]