6686646885 has 24 divisors (see below), whose sum is σ = 11593801440. Its totient is φ = 3565099872.

The previous prime is 6686646881. The next prime is 6686646887. The reversal of 6686646885 is 5886466866.

It is not a de Polignac number, because 6686646885 - 2² = 6686646881 is a prime.

It is a super-2 number, since 2×6686646885² = 89422493129360406450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6686646881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 134586 + ... + 177444.

It is an arithmetic number, because the mean of its divisors is an integer number (483075060).

Almost surely, 2^6686646885 is an apocalyptic number.

It is an amenable number.

6686646885 is a deficient number, since it is larger than the sum of its proper divisors (4907154555).

6686646885 is a wasteful number, since it uses less digits than its factorization.

6686646885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46337 (or 46334 counting only the distinct ones).

The product of its digits is 79626240, while the sum is 63.

The square root of 6686646885 is about 81771.9199053073. The cubic root of 6686646885 is about 1883.9503930641.

The spelling of 6686646885 in words is "six billion, six hundred eighty-six million, six hundred forty-six thousand, eight hundred eighty-five".