79799936152561 has 9 divisors (see below), whose sum is σ = 79859090154081. Its totient is φ = 79740825955584.

The previous prime is 79799936152523. The next prime is 79799936152589. The reversal of 79799936152561 is 16525163999797.

The square root of 79799936152561 is 8933081.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 29971584586161 + 49828351566400 = 5474631^2 + 7058920^2 .

It is not a de Polignac number, because 79799936152561 - 2²⁷ = 79799801934833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79799936102561) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 16874587645 + ... + 16874592373.

Almost surely, 2^{79799936152561} is an apocalyptic number.

79799936152561 is the 8933081-st square number.

79799936152561 is the 4466541-st centered octagonal number.

It is an amenable number.

79799936152561 is a deficient number, since it is larger than the sum of its proper divisors (59154001520).

79799936152561 is an frugal number, since it uses more digits than its factorization.

79799936152561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13236 (or 6618 counting only the distinct ones).

The product of its digits is 1736040600, while the sum is 79.

The spelling of 79799936152561 in words is "seventy-nine trillion, seven hundred ninety-nine billion, nine hundred thirty-six million, one hundred fifty-two thousand, five hundred sixty-one".