79661124864 has 144 divisors (see below), whose sum is σ = 245814710400. Its totient is φ = 25399148544.

The previous prime is 79661124827. The next prime is 79661124869. The reversal of 79661124864 is 46842116697.

79661124864 is a `hidden beast` number, since 7 + 96 + 61 + 12 + 486 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 79661124864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79661124869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91569 + ... + 409520.

It is an arithmetic number, because the mean of its divisors is an integer number (1707046600).

Almost surely, 2^79661124864 is an apocalyptic number.

It is an amenable number.

79661124864 is an abundant number, since it is smaller than the sum of its proper divisors (166153585536).

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

79661124864 is a wasteful number, since it uses less digits than its factorization.

79661124864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501137 (or 501117 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The spelling of 79661124864 in words is "seventy-nine billion, six hundred sixty-one million, one hundred twenty-four thousand, eight hundred sixty-four".