18686921100 has 36 divisors (see below), whose sum is σ = 54067492584. Its totient is φ = 4983178880.

The previous prime is 18686921069. The next prime is 18686921129. The reversal of 18686921100 is 112968681.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31144569 + ... + 31145168.

It is an arithmetic number, because the mean of its divisors is an integer number (1501874794).

Almost surely, 2^18686921100 is an apocalyptic number.

18686921100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18686921100 is an abundant number, since it is smaller than the sum of its proper divisors (35380571484).

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

18686921100 is a wasteful number, since it uses less digits than its factorization.

18686921100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62289754 (or 62289747 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 42.

The spelling of 18686921100 in words is "eighteen billion, six hundred eighty-six million, nine hundred twenty-one thousand, one hundred".