79136872321 has 4 divisors (see below), whose sum is σ = 85224324052. Its totient is φ = 73049420592.

The previous prime is 79136872301. The next prime is 79136872361. The reversal of 79136872321 is 12327863197.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12327863197 = 13 ⋅948297169.

It can be written as a sum of positive squares in 2 ways, for example, as 5641662321 + 73495210000 = 75111^2 + 271100^2 .

It is a cyclic number.

It is not a de Polignac number, because 79136872321 - 2⁹ = 79136871809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79136872301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3043725846 + ... + 3043725871.

It is an arithmetic number, because the mean of its divisors is an integer number (21306081013).

Almost surely, 2^79136872321 is an apocalyptic number.

It is an amenable number.

79136872321 is a deficient number, since it is larger than the sum of its proper divisors (6087451731).

79136872321 is a wasteful number, since it uses less digits than its factorization.

79136872321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6087451730.

The product of its digits is 762048, while the sum is 49.

The spelling of 79136872321 in words is "seventy-nine billion, one hundred thirty-six million, eight hundred seventy-two thousand, three hundred twenty-one".