18688118884398 has 128 divisors (see below), whose sum is σ = 45142751232000. Its totient is φ = 5708900360160.

The previous prime is 18688118884397. The next prime is 18688118884447. The reversal of 18688118884398 is 89348881188681.

18688118884398 is a `hidden beast` number, since 1 + 8 + 68 + 8 + 11 + 88 + 84 + 398 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18688118884397) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 81913761 + ... + 82141587.

It is an arithmetic number, because the mean of its divisors is an integer number (352677744000).

Almost surely, 2^{18688118884398} is an apocalyptic number.

18688118884398 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18688118884398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22571375616000).

18688118884398 is an abundant number, since it is smaller than the sum of its proper divisors (26454632347602).

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

18688118884398 is a wasteful number, since it uses less digits than its factorization.

18688118884398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230467 (or 230461 counting only the distinct ones).

The product of its digits is 1358954496, while the sum is 81.

The spelling of 18688118884398 in words is "eighteen trillion, six hundred eighty-eight billion, one hundred eighteen million, eight hundred eighty-four thousand, three hundred ninety-eight".