79139327161 has 4 divisors (see below), whose sum is σ = 79152947172. Its totient is φ = 79125707152.

The previous prime is 79139327149. The next prime is 79139327171. The reversal of 79139327161 is 16172393197.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16172393197 = 8923 ⋅1812439.

It can be written as a sum of positive squares in 2 ways, for example, as 71646693561 + 7492633600 = 267669^2 + 86560^2 .

It is a cyclic number.

It is not a de Polignac number, because 79139327161 - 2¹¹ = 79139325113 is a prime.

It is a Smith number, since the sum of its digits (49) 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 not an unprimeable number, because it can be changed into a prime (79139327101) 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 3 ways as a sum of consecutive naturals, for example, 6801286 + ... + 6812911.

It is an arithmetic number, because the mean of its divisors is an integer number (19788236793).

Almost surely, 2^79139327161 is an apocalyptic number.

It is an amenable number.

79139327161 is a deficient number, since it is larger than the sum of its proper divisors (13620011).

79139327161 is a wasteful number, since it uses less digits than its factorization.

79139327161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13620010.

The product of its digits is 428652, while the sum is 49.

The spelling of 79139327161 in words is "seventy-nine billion, one hundred thirty-nine million, three hundred twenty-seven thousand, one hundred sixty-one".