18668686685 has 16 divisors (see below), whose sum is σ = 24442350912. Its totient is φ = 13575369600.

The previous prime is 18668686657. The next prime is 18668686739. The reversal of 18668686685 is 58668686681.

It is not a de Polignac number, because 18668686685 - 2¹⁶ = 18668621149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 481337 + ... + 518673.

It is an arithmetic number, because the mean of its divisors is an integer number (1527646932).

Almost surely, 2^18668686685 is an apocalyptic number.

It is an amenable number.

18668686685 is a deficient number, since it is larger than the sum of its proper divisors (5773664227).

18668686685 is a wasteful number, since it uses less digits than its factorization.

18668686685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46444.

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

The spelling of 18668686685 in words is "eighteen billion, six hundred sixty-eight million, six hundred eighty-six thousand, six hundred eighty-five".