79912315561 has 8 divisors (see below), whose sum is σ = 88835527424. Its totient is φ = 71385690960.

The previous prime is 79912315487. The next prime is 79912315591. The reversal of 79912315561 is 16551321997.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79912315561 - 2¹⁹ = 79911791273 is a prime.

It is a super-5 number, since 5×79912315561⁵ (a number of 56 digits) contains 55555 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79912315591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99146391 + ... + 99147196.

It is an arithmetic number, because the mean of its divisors is an integer number (11104440928).

Almost surely, 2^79912315561 is an apocalyptic number.

It is an amenable number.

79912315561 is a deficient number, since it is larger than the sum of its proper divisors (8923211863).

79912315561 is a wasteful number, since it uses less digits than its factorization.

79912315561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198293631.

The product of its digits is 510300, while the sum is 49.

The spelling of 79912315561 in words is "seventy-nine billion, nine hundred twelve million, three hundred fifteen thousand, five hundred sixty-one".