18686866870 has 24 divisors (see below), whose sum is σ = 39128012064. Its totient is φ = 6406925616.

The previous prime is 18686866853. The next prime is 18686866921. The reversal of 18686866870 is 7866868681.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19067742 + ... + 19068721.

It is an arithmetic number, because the mean of its divisors is an integer number (1630333836).

Almost surely, 2^18686866870 is an apocalyptic number.

18686866870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18686866870 is an abundant number, since it is smaller than the sum of its proper divisors (20441145194).

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

18686866870 is a wasteful number, since it uses less digits than its factorization.

18686866870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38136484 (or 38136477 counting only the distinct ones).

The product of its (nonzero) digits is 37158912, while the sum is 64.

The spelling of 18686866870 in words is "eighteen billion, six hundred eighty-six million, eight hundred sixty-six thousand, eight hundred seventy".