256220855 has 16 divisors (see below), whose sum is σ = 355148064. Its totient is φ = 175380480.

The previous prime is 256220831. The next prime is 256220869. The reversal of 256220855 is 558022652.

It is not a de Polignac number, because 256220855 - 2⁸ = 256220599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136082 + ... + 137951.

It is an arithmetic number, because the mean of its divisors is an integer number (22196754).

Almost surely, 2^256220855 is an apocalyptic number.

256220855 is a deficient number, since it is larger than the sum of its proper divisors (98927209).

256220855 is a wasteful number, since it uses less digits than its factorization.

256220855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274066.

The product of its (nonzero) digits is 48000, while the sum is 35.

The square root of 256220855 is about 16006.9002308379. The cubic root of 256220855 is about 635.1429648962.

The spelling of 256220855 in words is "two hundred fifty-six million, two hundred twenty thousand, eight hundred fifty-five".