79644136217 has 16 divisors (see below), whose sum is σ = 86164377600. Its totient is φ = 73385254800.

The previous prime is 79644136207. The next prime is 79644136219. The reversal of 79644136217 is 71263144697.

It is a cyclic number.

It is not a de Polignac number, because 79644136217 - 2⁶ = 79644136153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79644136219) 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, 295409 + ... + 496542.

It is an arithmetic number, because the mean of its divisors is an integer number (5385273600).

Almost surely, 2^79644136217 is an apocalyptic number.

It is an amenable number.

79644136217 is a deficient number, since it is larger than the sum of its proper divisors (6520241383).

79644136217 is a wasteful number, since it uses less digits than its factorization.

79644136217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792116.

The product of its digits is 1524096, while the sum is 50.

The spelling of 79644136217 in words is "seventy-nine billion, six hundred forty-four million, one hundred thirty-six thousand, two hundred seventeen".