7921972791964 has 48 divisors (see below), whose sum is σ = 17361812514816. Its totient is φ = 3072642148800.

The previous prime is 7921972791947. The next prime is 7921972792031. The reversal of 7921972791964 is 4691972791297.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57601027 + ... + 57738394.

It is an arithmetic number, because the mean of its divisors is an integer number (361704427392).

Almost surely, 2^{7921972791964} is an apocalyptic number.

It is an amenable number.

7921972791964 is an abundant number, since it is smaller than the sum of its proper divisors (9439839722852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7921972791964 is a wasteful number, since it uses less digits than its factorization.

7921972791964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115339666 (or 115339664 counting only the distinct ones).

The product of its digits is 216040608, while the sum is 73.

The spelling of 7921972791964 in words is "seven trillion, nine hundred twenty-one billion, nine hundred seventy-two million, seven hundred ninety-one thousand, nine hundred sixty-four".