256855455 has 20 divisors (see below), whose sum is σ = 460437912. Its totient is φ = 136989360.

The previous prime is 256855453. The next prime is 256855477. The reversal of 256855455 is 554558652.

256855455 is a `hidden beast` number, since 25 + 6 + 85 + 545 + 5 = 666.

It is not a de Polignac number, because 256855455 - 2¹ = 256855453 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 256855455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256855453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 316701 + ... + 317510.

Almost surely, 2^256855455 is an apocalyptic number.

256855455 is a deficient number, since it is larger than the sum of its proper divisors (203582457).

256855455 is an equidigital number, since it uses as much as digits as its factorization.

256855455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634228 (or 634219 counting only the distinct ones).

The product of its digits is 1200000, while the sum is 45.

The square root of 256855455 is about 16026.7106731232. The cubic root of 256855455 is about 635.6669001538. Note that the first 3 decimals are identical.

The spelling of 256855455 in words is "two hundred fifty-six million, eight hundred fifty-five thousand, four hundred fifty-five".