7721951980264 has 128 divisors (see below), whose sum is σ = 15465250944000. Its totient is φ = 3607664707584.

The previous prime is 7721951980261. The next prime is 7721951980289. The reversal of 7721951980264 is 4620891591277.

It is a super-2 number, since 2×7721951980264² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7721951980261) 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, 2878102267 + ... + 2878104949.

It is an arithmetic number, because the mean of its divisors is an integer number (120822273000).

Almost surely, 2^{7721951980264} is an apocalyptic number.

7721951980264 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

It is an amenable number.

7721951980264 is an abundant number, since it is smaller than the sum of its proper divisors (7743298963736).

7721951980264 is a wasteful number, since it uses less digits than its factorization.

7721951980264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4427 (or 4423 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 61.

The spelling of 7721951980264 in words is "seven trillion, seven hundred twenty-one billion, nine hundred fifty-one million, nine hundred eighty thousand, two hundred sixty-four".