256346023415 has 4 divisors (see below), whose sum is σ = 307615228104. Its totient is φ = 205076818728.

The previous prime is 256346023403. The next prime is 256346023429. The reversal of 256346023415 is 514320643652.

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-256346023415 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 3 ways as a sum of consecutive naturals, for example, 25634602337 + ... + 25634602346.

It is an arithmetic number, because the mean of its divisors is an integer number (76903807026).

Almost surely, 2^256346023415 is an apocalyptic number.

256346023415 is a deficient number, since it is larger than the sum of its proper divisors (51269204689).

256346023415 is an equidigital number, since it uses as much as digits as its factorization.

256346023415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51269204688.

The product of its (nonzero) digits is 518400, while the sum is 41.

The spelling of 256346023415 in words is "two hundred fifty-six billion, three hundred forty-six million, twenty-three thousand, four hundred fifteen".