256734730023015 has 32 divisors (see below), whose sum is σ = 417814706050560. Its totient is φ = 134579663789184.

The previous prime is 256734730022989. The next prime is 256734730023029. The reversal of 256734730023015 is 510320037437652.

It is a happy number.

It is not a de Polignac number, because 256734730023015 - 2¹² = 256734730018919 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21866179 + ... + 31489668.

It is an arithmetic number, because the mean of its divisors is an integer number (13056709564080).

Almost surely, 2^{256734730023015} is an apocalyptic number.

256734730023015 is a deficient number, since it is larger than the sum of its proper divisors (161079976027545).

256734730023015 is a wasteful number, since it uses less digits than its factorization.

256734730023015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53361351.

The product of its (nonzero) digits is 3175200, while the sum is 48.

The spelling of 256734730023015 in words is "two hundred fifty-six trillion, seven hundred thirty-four billion, seven hundred thirty million, twenty-three thousand, fifteen".