7931666864 has 20 divisors (see below), whose sum is σ = 16764659880. Its totient is φ = 3605303040.

The previous prime is 7931666839. The next prime is 7931666887. The reversal of 7931666864 is 4686661397.

It is a super-2 number, since 2×7931666864² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22532969 + ... + 22533320.

It is an arithmetic number, because the mean of its divisors is an integer number (838232994).

Almost surely, 2^7931666864 is an apocalyptic number.

It is an amenable number.

7931666864 is an abundant number, since it is smaller than the sum of its proper divisors (8832993016).

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

7931666864 is a wasteful number, since it uses less digits than its factorization.

7931666864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45066308 (or 45066302 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 56.

The square root of 7931666864 is about 89059.9060408218. The cubic root of 7931666864 is about 1994.2892813663.

The spelling of 7931666864 in words is "seven billion, nine hundred thirty-one million, six hundred sixty-six thousand, eight hundred sixty-four".