256915455 has 16 divisors (see below), whose sum is σ = 411414144. Its totient is φ = 136905120.

The previous prime is 256915427. The next prime is 256915481. The reversal of 256915455 is 554519652.

It is not a de Polignac number, because 256915455 - 2⁵ = 256915423 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 12732 + ... + 25998.

It is an arithmetic number, because the mean of its divisors is an integer number (25713384).

Almost surely, 2^256915455 is an apocalyptic number.

256915455 is a deficient number, since it is larger than the sum of its proper divisors (154498689).

256915455 is a wasteful number, since it uses less digits than its factorization.

256915455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14566.

The product of its digits is 270000, while the sum is 42.

The square root of 256915455 is about 16028.5824388809. The cubic root of 256915455 is about 635.7163923797.

The spelling of 256915455 in words is "two hundred fifty-six million, nine hundred fifteen thousand, four hundred fifty-five".