79912705693 has 4 divisors (see below), whose sum is σ = 80197092828. Its totient is φ = 79628318560.

The previous prime is 79912705673. The next prime is 79912705699. The reversal of 79912705693 is 39650721997.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46875281049 + 33037424644 = 216507^2 + 181762^2 .

It is a cyclic number.

It is not a de Polignac number, because 79912705693 - 2⁵ = 79912705661 is a prime.

It is a super-2 number, since 2×79912705693² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79912705699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142193146 + ... + 142193707.

It is an arithmetic number, because the mean of its divisors is an integer number (20049273207).

Almost surely, 2^79912705693 is an apocalyptic number.

It is an amenable number.

79912705693 is a deficient number, since it is larger than the sum of its proper divisors (284387135).

79912705693 is a wasteful number, since it uses less digits than its factorization.

79912705693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284387134.

The product of its (nonzero) digits is 6429780, while the sum is 58.

The spelling of 79912705693 in words is "seventy-nine billion, nine hundred twelve million, seven hundred five thousand, six hundred ninety-three".