18685867888 has 40 divisors (see below), whose sum is σ = 37490993280. Its totient is φ = 9011439360.

The previous prime is 18685867847. The next prime is 18685867891. The reversal of 18685867888 is 88876858681.

It is a self number, because there is not a number n which added to its sum of digits gives 18685867888.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 439506 + ... + 480142.

It is an arithmetic number, because the mean of its divisors is an integer number (937274832).

Almost surely, 2^18685867888 is an apocalyptic number.

It is an amenable number.

18685867888 is an abundant number, since it is smaller than the sum of its proper divisors (18805125392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18685867888 is a wasteful number, since it uses less digits than its factorization.

18685867888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41665 (or 41659 counting only the distinct ones).

The product of its digits is 330301440, while the sum is 73.

The spelling of 18685867888 in words is "eighteen billion, six hundred eighty-five million, eight hundred sixty-seven thousand, eight hundred eighty-eight".