256918455 has 12 divisors (see below), whose sum is σ = 445325400. Its totient is φ = 137023152.

The previous prime is 256918451. The next prime is 256918477. The reversal of 256918455 is 554819652.

256918455 is a `hidden beast` number, since 2 + 569 + 1 + 84 + 5 + 5 = 666.

It is not a de Polignac number, because 256918455 - 2² = 256918451 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 5709299 = 256918455 / (2 + 5 + 6 + 9 + 1 + 8 + 4 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 256918455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256918451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2854605 + ... + 2854694.

It is an arithmetic number, because the mean of its divisors is an integer number (37110450).

Almost surely, 2^256918455 is an apocalyptic number.

256918455 is a deficient number, since it is larger than the sum of its proper divisors (188406945).

256918455 is a wasteful number, since it uses less digits than its factorization.

256918455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5709310 (or 5709307 counting only the distinct ones).

The product of its digits is 432000, while the sum is 45.

The square root of 256918455 is about 16028.6760214311. The cubic root of 256918455 is about 635.7188667888.

The spelling of 256918455 in words is "two hundred fifty-six million, nine hundred eighteen thousand, four hundred fifty-five".