79857657531 has 24 divisors (see below), whose sum is σ = 116380053504. Its totient is φ = 52763886000.

The previous prime is 79857657491. The next prime is 79857657629. The reversal of 79857657531 is 13575675897.

79857657531 is a `hidden beast` number, since 7 + 9 + 8 + 57 + 6 + 575 + 3 + 1 = 666.

It is not a de Polignac number, because 79857657531 - 2²² = 79853463227 is a prime.

It is a super-2 number, since 2×79857657531² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (79857655531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1069156 + ... + 1141406.

It is an arithmetic number, because the mean of its divisors is an integer number (4849168896).

Almost surely, 2^79857657531 is an apocalyptic number.

79857657531 is a deficient number, since it is larger than the sum of its proper divisors (36522395973).

79857657531 is a wasteful number, since it uses less digits than its factorization.

79857657531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73351 (or 73348 counting only the distinct ones).

The product of its digits is 55566000, while the sum is 63.

The spelling of 79857657531 in words is "seventy-nine billion, eight hundred fifty-seven million, six hundred fifty-seven thousand, five hundred thirty-one".