79643617538 has 16 divisors (see below), whose sum is σ = 122897827584. Its totient is φ = 38690044320.

The previous prime is 79643617513. The next prime is 79643617561. The reversal of 79643617538 is 83571634697.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3079358 + ... + 3105113.

It is an arithmetic number, because the mean of its divisors is an integer number (7681114224).

Almost surely, 2^79643617538 is an apocalyptic number.

79643617538 is a deficient number, since it is larger than the sum of its proper divisors (43254210046).

79643617538 is a wasteful number, since it uses less digits than its factorization.

79643617538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6184657.

The product of its digits is 22861440, while the sum is 59.

The spelling of 79643617538 in words is "seventy-nine billion, six hundred forty-three million, six hundred seventeen thousand, five hundred thirty-eight".