856887165124 has 9 divisors (see below), whose sum is σ = 1499555778861. Its totient is φ = 428442656880.

The previous prime is 856887165097. The next prime is 856887165163. The reversal of 856887165124 is 421561788658.

The square root of 856887165124 is 925682.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 853624470724 + 3262694400 = 923918^2 + 57120^2 .

It is a super-2 number, since 2×856887165124² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1619944 + ... + 2082784.

Almost surely, 2^856887165124 is an apocalyptic number.

856887165124 is the 925682-nd square number.

It is an amenable number.

856887165124 is a deficient number, since it is larger than the sum of its proper divisors (642668613737).

856887165124 is an frugal number, since it uses more digits than its factorization.

856887165124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925686 (or 462843 counting only the distinct ones).

The product of its digits is 25804800, while the sum is 61.

The spelling of 856887165124 in words is "eight hundred fifty-six billion, eight hundred eighty-seven million, one hundred sixty-five thousand, one hundred twenty-four".