79157388644 has 24 divisors (see below), whose sum is σ = 138817287000. Its totient is φ = 39495357440.

The previous prime is 79157388623. The next prime is 79157388679. The reversal of 79157388644 is 44688375197.

It can be written as a sum of positive squares in 4 ways, for example, as 35593350244 + 43564038400 = 188662^2 + 208720^2 .

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, 10577384 + ... + 10584864.

It is an arithmetic number, because the mean of its divisors is an integer number (5784053625).

Almost surely, 2^79157388644 is an apocalyptic number.

It is an amenable number.

79157388644 is a deficient number, since it is larger than the sum of its proper divisors (59659898356).

79157388644 is a wasteful number, since it uses less digits than its factorization.

79157388644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12703 (or 12701 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 62.

The spelling of 79157388644 in words is "seventy-nine billion, one hundred fifty-seven million, three hundred eighty-eight thousand, six hundred forty-four".