18688367218842 has 64 divisors (see below), whose sum is σ = 42159110169600. Its totient is φ = 6135230288880.

The previous prime is 18688367218837. The next prime is 18688367218847. The reversal of 18688367218842 is 24881276388681.

18688367218842 is a `hidden beast` number, since 1 + 8 + 6 + 8 + 8 + 367 + 218 + 8 + 42 = 666.

It is an interprime number because it is at equal distance from previous prime (18688367218837) and next prime (18688367218847).

It is not an unprimeable number, because it can be changed into a prime (18688367218847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1057209 + ... + 6204387.

It is an arithmetic number, because the mean of its divisors is an integer number (658736096400).

Almost surely, 2^{18688367218842} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18688367218842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21079555084800).

18688367218842 is an abundant number, since it is smaller than the sum of its proper divisors (23470742950758).

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

18688367218842 is a wasteful number, since it uses less digits than its factorization.

18688367218842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5148208 (or 5148202 counting only the distinct ones).

The product of its digits is 396361728, while the sum is 72.

The spelling of 18688367218842 in words is "eighteen trillion, six hundred eighty-eight billion, three hundred sixty-seven million, two hundred eighteen thousand, eight hundred forty-two".