18686686685 has 16 divisors (see below), whose sum is σ = 22536558720. Its totient is φ = 14874484800.

The previous prime is 18686686663. The next prime is 18686686693. The reversal of 18686686685 is 58668668681.

It is not a de Polignac number, because 18686686685 - 2⁶ = 18686686621 is a prime.

It is a congruent number.

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, 982496 + ... + 1001334.

It is an arithmetic number, because the mean of its divisors is an integer number (1408534920).

Almost surely, 2^18686686685 is an apocalyptic number.

It is an amenable number.

18686686685 is a deficient number, since it is larger than the sum of its proper divisors (3849872035).

18686686685 is a wasteful number, since it uses less digits than its factorization.

18686686685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19828.

The product of its digits is 159252480, while the sum is 68.

The spelling of 18686686685 in words is "eighteen billion, six hundred eighty-six million, six hundred eighty-six thousand, six hundred eighty-five".