6681090138 has 32 divisors (see below), whose sum is σ = 13979347200. Its totient is φ = 2126480640.

The previous prime is 6681090113. The next prime is 6681090149. The reversal of 6681090138 is 8310901866.

6681090138 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 6681090138.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 277363 + ... + 300486.

It is an arithmetic number, because the mean of its divisors is an integer number (436854600).

Almost surely, 2^6681090138 is an apocalyptic number.

6681090138 is an abundant number, since it is smaller than the sum of its proper divisors (7298257062).

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

6681090138 is a wasteful number, since it uses less digits than its factorization.

6681090138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577942.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 6681090138 is about 81737.9357336604. The cubic root of 6681090138 is about 1883.4283807062.

The spelling of 6681090138 in words is "six billion, six hundred eighty-one million, ninety thousand, one hundred thirty-eight".