256015256423 has 4 divisors (see below), whose sum is σ = 256023747480. Its totient is φ = 256006765368.

The previous prime is 256015256417. The next prime is 256015256479. The reversal of 256015256423 is 324652510652.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256015256423 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 (256015256023) 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, 4200140 + ... + 4260657.

It is an arithmetic number, because the mean of its divisors is an integer number (64005936870).

Almost surely, 2^256015256423 is an apocalyptic number.

256015256423 is a deficient number, since it is larger than the sum of its proper divisors (8491057).

256015256423 is an equidigital number, since it uses as much as digits as its factorization.

256015256423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8491056.

The product of its (nonzero) digits is 432000, while the sum is 41.

The spelling of 256015256423 in words is "two hundred fifty-six billion, fifteen million, two hundred fifty-six thousand, four hundred twenty-three".