79561726478 has 32 divisors (see below), whose sum is σ = 130824439200. Its totient is φ = 36064978560.

The previous prime is 79561726451. The next prime is 79561726483. The reversal of 79561726478 is 87462716597.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 79561726478.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1036673 + ... + 1110771.

It is an arithmetic number, because the mean of its divisors is an integer number (4088263725).

Almost surely, 2^79561726478 is an apocalyptic number.

79561726478 is a deficient number, since it is larger than the sum of its proper divisors (51262712722).

79561726478 is a wasteful number, since it uses less digits than its factorization.

79561726478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74852.

The product of its digits is 35562240, while the sum is 62.

The spelling of 79561726478 in words is "seventy-nine billion, five hundred sixty-one million, seven hundred twenty-six thousand, four hundred seventy-eight".