79197820957 has 16 divisors (see below), whose sum is σ = 81900346752. Its totient is φ = 76554455040.

The previous prime is 79197820931. The next prime is 79197820969. The reversal of 79197820957 is 75902879197.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79197820957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79197820157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 683173 + ... + 790645.

It is an arithmetic number, because the mean of its divisors is an integer number (5118771672).

Almost surely, 2^79197820957 is an apocalyptic number.

It is an amenable number.

79197820957 is a deficient number, since it is larger than the sum of its proper divisors (2702525795).

79197820957 is a wasteful number, since it uses less digits than its factorization.

79197820957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107748.

The product of its (nonzero) digits is 20003760, while the sum is 64.

The spelling of 79197820957 in words is "seventy-nine billion, one hundred ninety-seven million, eight hundred twenty thousand, nine hundred fifty-seven".