7979657947191 has 32 divisors (see below), whose sum is σ = 13512999603200. Its totient is φ = 4558971716640.

The previous prime is 7979657947159. The next prime is 7979657947193. The reversal of 7979657947191 is 1917497569797.

7979657947191 is a `hidden beast` number, since 7 + 9 + 7 + 9 + 6 + 57 + 9 + 471 + 91 = 666.

It is not a de Polignac number, because 7979657947191 - 2⁵ = 7979657947159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7979657947191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7979657947193) 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, 2817400 + ... + 4888461.

It is an arithmetic number, because the mean of its divisors is an integer number (422281237600).

Almost surely, 2^{7979657947191} is an apocalyptic number.

7979657947191 is a deficient number, since it is larger than the sum of its proper divisors (5533341656009).

7979657947191 is a wasteful number, since it uses less digits than its factorization.

7979657947191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7711356 (or 7711350 counting only the distinct ones).

The product of its digits is 1890355320, while the sum is 81.

The spelling of 7979657947191 in words is "seven trillion, nine hundred seventy-nine billion, six hundred fifty-seven million, nine hundred forty-seven thousand, one hundred ninety-one".