79769079661 has 4 divisors (see below), whose sum is σ = 79769850300. Its totient is φ = 79768309024.

The previous prime is 79769079659. The next prime is 79769079673. The reversal of 79769079661 is 16697096797.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16697096797 = 1163 ⋅14356919.

It can be written as a sum of positive squares in 2 ways, for example, as 64989814761 + 14779264900 = 254931^2 + 121570^2 .

It is a cyclic number.

It is not a de Polignac number, because 79769079661 - 2¹ = 79769079659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79769079631) 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, 200506 + ... + 446923.

It is an arithmetic number, because the mean of its divisors is an integer number (19942462575).

Almost surely, 2^79769079661 is an apocalyptic number.

It is an amenable number.

79769079661 is a deficient number, since it is larger than the sum of its proper divisors (770639).

79769079661 is a wasteful number, since it uses less digits than its factorization.

79769079661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770638.

The product of its (nonzero) digits is 54010152, while the sum is 67.

The spelling of 79769079661 in words is "seventy-nine billion, seven hundred sixty-nine million, seventy-nine thousand, six hundred sixty-one".