6686918684 has 12 divisors (see below), whose sum is σ = 12018381144. Its totient is φ = 3253095504.

The previous prime is 6686918677. The next prime is 6686918699. The reversal of 6686918684 is 4868196866.

It is a super-4 number, since 4×6686918684⁴ (a number of 40 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22590794 + ... + 22591089.

It is an arithmetic number, because the mean of its divisors is an integer number (1001531762).

Almost surely, 2^6686918684 is an apocalyptic number.

It is an amenable number.

6686918684 is a deficient number, since it is larger than the sum of its proper divisors (5331462460).

6686918684 is a wasteful number, since it uses less digits than its factorization.

6686918684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45181924 (or 45181922 counting only the distinct ones).

The product of its digits is 23887872, while the sum is 62.

The square root of 6686918684 is about 81773.5818220041. The cubic root of 6686918684 is about 1883.9759190068.

The spelling of 6686918684 in words is "six billion, six hundred eighty-six million, nine hundred eighteen thousand, six hundred eighty-four".