79864857122 has 6 divisors (see below), whose sum is σ = 119797885179. Its totient is φ = 39932228730.

The previous prime is 79864857119. The next prime is 79864857157. The reversal of 79864857122 is 22175846897.

It can be written as a sum of positive squares in only one way, i.e., 39932428561 + 39932428561 = 199831^2 + 199831^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=199831.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 299747 + ... + 499577.

Almost surely, 2^79864857122 is an apocalyptic number.

79864857122 is a deficient number, since it is larger than the sum of its proper divisors (39933028057).

79864857122 is an frugal number, since it uses more digits than its factorization.

79864857122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399664 (or 199833 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 59.

The spelling of 79864857122 in words is "seventy-nine billion, eight hundred sixty-four million, eight hundred fifty-seven thousand, one hundred twenty-two".