255565563 has 16 divisors (see below), whose sum is σ = 372183552. Its totient is φ = 154700000.

The previous prime is 255565543. The next prime is 255565571. The reversal of 255565563 is 365565552.

It is a cyclic number.

It is not a de Polignac number, because 255565563 - 2⁸ = 255565307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (255565543) 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, 25813 + ... + 34313.

It is an arithmetic number, because the mean of its divisors is an integer number (23261472).

Almost surely, 2^255565563 is an apocalyptic number.

255565563 is a deficient number, since it is larger than the sum of its proper divisors (116617989).

255565563 is a wasteful number, since it uses less digits than its factorization.

255565563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9426.

The product of its digits is 675000, while the sum is 42.

The square root of 255565563 is about 15986.4180791070. The cubic root of 255565563 is about 634.6010373384.

The spelling of 255565563 in words is "two hundred fifty-five million, five hundred sixty-five thousand, five hundred sixty-three".