255915855 has 60 divisors (see below), whose sum is σ = 496888920. Its totient is φ = 125955648.

The previous prime is 255915823. The next prime is 255915911. The reversal of 255915855 is 558519552.

255915855 is a `hidden beast` number, since 2 + 5 + 591 + 5 + 8 + 55 = 666.

It is not a de Polignac number, because 255915855 - 2⁵ = 255915823 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 255915855.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 66576 + ... + 70314.

It is an arithmetic number, because the mean of its divisors is an integer number (8281482).

Almost surely, 2^255915855 is an apocalyptic number.

255915855 is a deficient number, since it is larger than the sum of its proper divisors (240973065).

255915855 is a wasteful number, since it uses less digits than its factorization.

255915855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3782 (or 3760 counting only the distinct ones).

The product of its digits is 450000, while the sum is 45.

The square root of 255915855 is about 15997.3702526384. The cubic root of 255915855 is about 634.8908444858.

The spelling of 255915855 in words is "two hundred fifty-five million, nine hundred fifteen thousand, eight hundred fifty-five".