79379421077 has 4 divisors (see below), whose sum is σ = 86595732096. Its totient is φ = 72163110060.

The previous prime is 79379421067. The next prime is 79379421109. The reversal of 79379421077 is 77012497397.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77012497397 = 11 ⋅7001136127.

It is a cyclic number.

It is not a de Polignac number, because 79379421077 - 2²² = 79375226773 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 (79379421067) 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, 3608155493 + ... + 3608155514.

It is an arithmetic number, because the mean of its divisors is an integer number (21648933024).

Almost surely, 2^79379421077 is an apocalyptic number.

It is an amenable number.

79379421077 is a deficient number, since it is larger than the sum of its proper divisors (7216311019).

79379421077 is a wasteful number, since it uses less digits than its factorization.

79379421077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7216311018.

The product of its (nonzero) digits is 4667544, while the sum is 56.

The spelling of 79379421077 in words is "seventy-nine billion, three hundred seventy-nine million, four hundred twenty-one thousand, seventy-seven".