255991455 has 32 divisors (see below), whose sum is σ = 456376320. Its totient is φ = 136144800.

The previous prime is 255991451. The next prime is 255991499. The reversal of 255991455 is 554199552.

255991455 is a `hidden beast` number, since 2 + 5 + 599 + 1 + 4 + 55 = 666.

It is not a de Polignac number, because 255991455 - 2² = 255991451 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 255991455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255991451) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49230 + ... + 54180.

It is an arithmetic number, because the mean of its divisors is an integer number (14261760).

Almost surely, 2^255991455 is an apocalyptic number.

255991455 is a deficient number, since it is larger than the sum of its proper divisors (200384865).

255991455 is a wasteful number, since it uses less digits than its factorization.

255991455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5348 (or 5342 counting only the distinct ones).

The product of its digits is 405000, while the sum is 45.

The square root of 255991455 is about 15999.7329665217. The cubic root of 255991455 is about 634.9533559472.

The spelling of 255991455 in words is "two hundred fifty-five million, nine hundred ninety-one thousand, four hundred fifty-five".