6681636992 has 32 divisors (see below), whose sum is σ = 13350658620. Its totient is φ = 3330883584.

The previous prime is 6681636989. The next prime is 6681637043. The reversal of 6681636992 is 2996361866.

It can be written as a sum of positive squares in 2 ways, for example, as 6067786816 + 613850176 = 77896^2 + 24776^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-4 number, since 4×6681636992⁴ (a number of 40 digits) contains 4444 as substring.

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 3 ways as a sum of consecutive naturals, for example, 34313 + ... + 120584.

Almost surely, 2^6681636992 is an apocalyptic number.

It is an amenable number.

6681636992 is a deficient number, since it is larger than the sum of its proper divisors (6669021628).

6681636992 is a wasteful number, since it uses less digits than its factorization.

6681636992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155248 (or 155236 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 56.

The square root of 6681636992 is about 81741.2808316581. The cubic root of 6681636992 is about 1883.4797661449.

The spelling of 6681636992 in words is "six billion, six hundred eighty-one million, six hundred thirty-six thousand, nine hundred ninety-two".