79550392138 has 16 divisors (see below), whose sum is σ = 136384020864. Its totient is φ = 34090045200.

The previous prime is 79550392133. The next prime is 79550392213. The reversal of 79550392138 is 83129305597.

It is a super-2 number, since 2×79550392138² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (79550392133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78438 + ... + 406513.

It is an arithmetic number, because the mean of its divisors is an integer number (8524001304).

Almost surely, 2^79550392138 is an apocalyptic number.

79550392138 is a deficient number, since it is larger than the sum of its proper divisors (56833628726).

79550392138 is a wasteful number, since it uses less digits than its factorization.

79550392138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496677.

The product of its (nonzero) digits is 2041200, while the sum is 52.

The spelling of 79550392138 in words is "seventy-nine billion, five hundred fifty million, three hundred ninety-two thousand, one hundred thirty-eight".