256026555 has 32 divisors (see below), whose sum is σ = 456952320. Its totient is φ = 136009440.

The previous prime is 256026527. The next prime is 256026557. The reversal of 256026555 is 555620652.

256026555 is a `hidden beast` number, since 25 + 60 + 26 + 555 = 666.

It is not a de Polignac number, because 256026555 - 2⁸ = 256026299 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (256026557) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 31900 + ... + 39110.

It is an arithmetic number, because the mean of its divisors is an integer number (14279760).

Almost surely, 2^256026555 is an apocalyptic number.

256026555 is a deficient number, since it is larger than the sum of its proper divisors (200925765).

256026555 is a wasteful number, since it uses less digits than its factorization.

256026555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7488 (or 7482 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

The square root of 256026555 is about 16000.8298222311. The cubic root of 256026555 is about 634.9823749422.

The spelling of 256026555 in words is "two hundred fifty-six million, twenty-six thousand, five hundred fifty-five".