257056117231515 has 32 divisors (see below), whose sum is σ = 470049378808320. Its totient is φ = 117510391052544.

The previous prime is 257056117231483. The next prime is 257056117231519. The reversal of 257056117231515 is 515132711650752.

It is not a de Polignac number, because 257056117231515 - 2⁵ = 257056117231483 is a prime.

It is a super-2 number, since 2×257056117231515² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257056117231519) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2592247 + ... + 22821743.

It is an arithmetic number, because the mean of its divisors is an integer number (14689043087760).

Almost surely, 2^{257056117231515} is an apocalyptic number.

257056117231515 is a deficient number, since it is larger than the sum of its proper divisors (212993261576805).

257056117231515 is a wasteful number, since it uses less digits than its factorization.

257056117231515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20350531.

The product of its (nonzero) digits is 2205000, while the sum is 51.

The spelling of 257056117231515 in words is "two hundred fifty-seven trillion, fifty-six billion, one hundred seventeen million, two hundred thirty-one thousand, five hundred fifteen".