256390472879 has 4 divisors (see below), whose sum is σ = 256859194584. Its totient is φ = 255921751176.

The previous prime is 256390472873. The next prime is 256390472887. The reversal of 256390472879 is 978274093652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256390472879 - 2³⁶ = 187670996143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256390472873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234360032 + ... + 234361125.

It is an arithmetic number, because the mean of its divisors is an integer number (64214798646).

Almost surely, 2^256390472879 is an apocalyptic number.

256390472879 is a deficient number, since it is larger than the sum of its proper divisors (468721705).

256390472879 is an equidigital number, since it uses as much as digits as its factorization.

256390472879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468721704.

The product of its (nonzero) digits is 45722880, while the sum is 62.

The spelling of 256390472879 in words is "two hundred fifty-six billion, three hundred ninety million, four hundred seventy-two thousand, eight hundred seventy-nine".