18685684130988 has 24 divisors (see below), whose sum is σ = 49828491016192. Its totient is φ = 5338766894544.

The previous prime is 18685684130983. The next prime is 18685684131007. The reversal of 18685684130988 is 88903148658681.

It is a super-2 number, since 2×18685684130988² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18685684130983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111224310220 + ... + 111224310387.

Almost surely, 2^{18685684130988} is an apocalyptic number.

It is an amenable number.

18685684130988 is an abundant number, since it is smaller than the sum of its proper divisors (31142806885204).

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

18685684130988 is a wasteful number, since it uses less digits than its factorization.

18685684130988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222448620621 (or 222448620619 counting only the distinct ones).

The product of its (nonzero) digits is 637009920, while the sum is 75.

The spelling of 18685684130988 in words is "eighteen trillion, six hundred eighty-five billion, six hundred eighty-four million, one hundred thirty thousand, nine hundred eighty-eight".