79661931858 has 24 divisors (see below), whose sum is σ = 172633032000. Its totient is φ = 26549026584.

The previous prime is 79661931821. The next prime is 79661931863. The reversal of 79661931858 is 85813916697.

79661931858 is a `hidden beast` number, since 7 + 9 + 6 + 619 + 3 + 1 + 8 + 5 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 79661931795 and 79661931804.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 312678 + ... + 507041.

It is an arithmetic number, because the mean of its divisors is an integer number (7193043000).

Almost surely, 2^79661931858 is an apocalyptic number.

79661931858 is an abundant number, since it is smaller than the sum of its proper divisors (92971100142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79661931858 is a wasteful number, since it uses less digits than its factorization.

79661931858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825126 (or 825123 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 63.

The spelling of 79661931858 in words is "seventy-nine billion, six hundred sixty-one million, nine hundred thirty-one thousand, eight hundred fifty-eight".