18910998868608 has 1536 divisors, whose sum is σ = 72736333824000. Its totient is φ = 4729798656000.

The previous prime is 18910998868603. The next prime is 18910998868637. The reversal of 18910998868608 is 80686889901981.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18910998868603) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 24591675648 + ... + 24591676416.

It is an arithmetic number, because the mean of its divisors is an integer number (47354384000).

Almost surely, 2^{18910998868608} is an apocalyptic number.

18910998868608 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18910998868608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36368166912000).

18910998868608 is an abundant number, since it is smaller than the sum of its proper divisors (53825334955392).

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

18910998868608 is a wasteful number, since it uses less digits than its factorization.

18910998868608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123 (or 1094 counting only the distinct ones).

The product of its (nonzero) digits is 859963392, while the sum is 81.

The spelling of 18910998868608 in words is "eighteen trillion, nine hundred ten billion, nine hundred ninety-eight million, eight hundred sixty-eight thousand, six hundred eight".