79717955393 has 16 divisors (see below), whose sum is σ = 80737554240. Its totient is φ = 78706059264.

The previous prime is 79717955389. The next prime is 79717955399. The reversal of 79717955393 is 39355971797.

It is a cyclic number.

It is not a de Polignac number, because 79717955393 - 2² = 79717955389 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79717955399) 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, 29979098 + ... + 29981756.

It is an arithmetic number, because the mean of its divisors is an integer number (5046097140).

Almost surely, 2^79717955393 is an apocalyptic number.

It is an amenable number.

79717955393 is a deficient number, since it is larger than the sum of its proper divisors (1019598847).

79717955393 is a wasteful number, since it uses less digits than its factorization.

79717955393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3968.

The product of its digits is 56260575, while the sum is 65.

The spelling of 79717955393 in words is "seventy-nine billion, seven hundred seventeen million, nine hundred fifty-five thousand, three hundred ninety-three".