255564961 has 16 divisors (see below), whose sum is σ = 280350720. Its totient is φ = 231920640.

The previous prime is 255564889. The next prime is 255564971. The reversal of 255564961 is 169465552.

It is a cyclic number.

It is not a de Polignac number, because 255564961 - 2²³ = 247176353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255564971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176880 + ... + 178318.

It is an arithmetic number, because the mean of its divisors is an integer number (17521920).

Almost surely, 2^255564961 is an apocalyptic number.

It is an amenable number.

255564961 is a deficient number, since it is larger than the sum of its proper divisors (24785759).

255564961 is a wasteful number, since it uses less digits than its factorization.

255564961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1824.

The product of its digits is 324000, while the sum is 43.

The square root of 255564961 is about 15986.3992506130. The cubic root of 255564961 is about 634.6005390578.

The spelling of 255564961 in words is "two hundred fifty-five million, five hundred sixty-four thousand, nine hundred sixty-one".