79257681217 has 32 divisors (see below), whose sum is σ = 94869968256. Its totient is φ = 65267328000.

The previous prime is 79257681179. The next prime is 79257681229. The reversal of 79257681217 is 71218675297.

It is a cyclic number.

It is not a de Polignac number, because 79257681217 - 2⁷ = 79257681089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79257681017) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1607778 + ... + 1656340.

It is an arithmetic number, because the mean of its divisors is an integer number (2964686508).

Almost surely, 2^79257681217 is an apocalyptic number.

It is an amenable number.

79257681217 is a deficient number, since it is larger than the sum of its proper divisors (15612287039).

79257681217 is a wasteful number, since it uses less digits than its factorization.

79257681217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48801.

The product of its digits is 2963520, while the sum is 55.

The spelling of 79257681217 in words is "seventy-nine billion, two hundred fifty-seven million, six hundred eighty-one thousand, two hundred seventeen".