256683555 has 48 divisors (see below), whose sum is σ = 459819360. Its totient is φ = 132378624.

The previous prime is 256683517. The next prime is 256683569. The reversal of 256683555 is 555386652.

256683555 is a `hidden beast` number, since 2 + 566 + 8 + 35 + 55 = 666.

It is not a de Polignac number, because 256683555 - 2⁶ = 256683491 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 256683555.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 210307 + ... + 211523.

It is an arithmetic number, because the mean of its divisors is an integer number (9579570).

Almost surely, 2^256683555 is an apocalyptic number.

256683555 is a deficient number, since it is larger than the sum of its proper divisors (203135805).

256683555 is a wasteful number, since it uses less digits than its factorization.

256683555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380 (or 1377 counting only the distinct ones).

The product of its digits is 1080000, while the sum is 45.

The square root of 256683555 is about 16021.3468534952. The cubic root of 256683555 is about 635.5250622400.

The spelling of 256683555 in words is "two hundred fifty-six million, six hundred eighty-three thousand, five hundred fifty-five".