79139927779 has 16 divisors (see below), whose sum is σ = 88691188320. Its totient is φ = 69982479360.

The previous prime is 79139927777. The next prime is 79139927813. The reversal of 79139927779 is 97772993197.

It is a cyclic number.

It is not a de Polignac number, because 79139927779 - 2¹ = 79139927777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79139927771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1656957 + ... + 1704049.

It is an arithmetic number, because the mean of its divisors is an integer number (5543199270).

Almost surely, 2^79139927779 is an apocalyptic number.

79139927779 is a deficient number, since it is larger than the sum of its proper divisors (9551260541).

79139927779 is a wasteful number, since it uses less digits than its factorization.

79139927779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51270.

The product of its digits is 94517766, while the sum is 70.

The spelling of 79139927779 in words is "seventy-nine billion, one hundred thirty-nine million, nine hundred twenty-seven thousand, seven hundred seventy-nine".