18688566874 has 16 divisors (see below), whose sum is σ = 28794576456. Its totient is φ = 9090446400.

The previous prime is 18688566851. The next prime is 18688566887. The reversal of 18688566874 is 47866588681.

It can be written as a sum of positive squares in 4 ways, for example, as 15204616249 + 3483950625 = 123307^2 + 59025^2 .

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 7 ways as a sum of consecutive naturals, for example, 701844 + ... + 727984.

Almost surely, 2^18688566874 is an apocalyptic number.

18688566874 is a deficient number, since it is larger than the sum of its proper divisors (10106009582).

18688566874 is a wasteful number, since it uses less digits than its factorization.

18688566874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35841.

The product of its digits is 123863040, while the sum is 67.

The spelling of 18688566874 in words is "eighteen billion, six hundred eighty-eight million, five hundred sixty-six thousand, eight hundred seventy-four".