6991976656 has 40 divisors (see below), whose sum is σ = 15859859904. Its totient is φ = 2923472640.

The previous prime is 6991976527. The next prime is 6991976669. The reversal of 6991976656 is 6566791996.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 756730 + ... + 765913.

Almost surely, 2^6991976656 is an apocalyptic number.

It is an amenable number.

6991976656 is an abundant number, since it is smaller than the sum of its proper divisors (8867883248).

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

6991976656 is a wasteful number, since it uses less digits than its factorization.

6991976656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1522699 (or 1522693 counting only the distinct ones).

The product of its digits is 33067440, while the sum is 64.

The square root of 6991976656 is about 83618.0402544810. The cubic root of 6991976656 is about 1912.2000412189.

The spelling of 6991976656 in words is "six billion, nine hundred ninety-one million, nine hundred seventy-six thousand, six hundred fifty-six".