79117985391 has 8 divisors (see below), whose sum is σ = 106260652464. Its totient is φ = 52360320960.

The previous prime is 79117985389. The next prime is 79117985497. The reversal of 79117985391 is 19358971197.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 79117985391 - 2¹ = 79117985389 is a prime.

It is a super-2 number, since 2×79117985391² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79117980391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96250180 + ... + 96251001.

It is an arithmetic number, because the mean of its divisors is an integer number (13282581558).

Almost surely, 2^79117985391 is an apocalyptic number.

79117985391 is a deficient number, since it is larger than the sum of its proper divisors (27142667073).

79117985391 is a wasteful number, since it uses less digits than its factorization.

79117985391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192501321.

The product of its digits is 4286520, while the sum is 60.

The spelling of 79117985391 in words is "seventy-nine billion, one hundred seventeen million, nine hundred eighty-five thousand, three hundred ninety-one".