6681931844 has 36 divisors (see below), whose sum is σ = 13617335340. Its totient is φ = 2860562880.

The previous prime is 6681931819. The next prime is 6681931873. The reversal of 6681931844 is 4481391866.

It can be written as a sum of positive squares in 2 ways, for example, as 3851691844 + 2830240000 = 62062^2 + 53200^2 .

It is a super-2 number, since 2×6681931844² = 89296426335722480672, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6681931792 and 6681931801.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 166322 + ... + 202550.

It is an arithmetic number, because the mean of its divisors is an integer number (378259315).

Almost surely, 2^6681931844 is an apocalyptic number.

It is an amenable number.

6681931844 is an abundant number, since it is smaller than the sum of its proper divisors (6935403496).

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

6681931844 is a wasteful number, since it uses less digits than its factorization.

6681931844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37188 (or 37179 counting only the distinct ones).

The product of its digits is 995328, while the sum is 50.

The square root of 6681931844 is about 81743.0843802704. The cubic root of 6681931844 is about 1883.5074709129.

The spelling of 6681931844 in words is "six billion, six hundred eighty-one million, nine hundred thirty-one thousand, eight hundred forty-four".