18118213568 has 224 divisors, whose sum is σ = 47314713600. Its totient is φ = 6686760960.

The previous prime is 18118213511. The next prime is 18118213583. The reversal of 18118213568 is 86531281181.

It is a tau number, because it is divible by the number of its divisors (224).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5490383 + ... + 5493681.

It is an arithmetic number, because the mean of its divisors is an integer number (211226400).

Almost surely, 2^18118213568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18118213568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23657356800).

18118213568 is an abundant number, since it is smaller than the sum of its proper divisors (29196500032).

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

18118213568 is a wasteful number, since it uses less digits than its factorization.

18118213568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3395 (or 3385 counting only the distinct ones).

The product of its digits is 92160, while the sum is 44.

The spelling of 18118213568 in words is "eighteen billion, one hundred eighteen million, two hundred thirteen thousand, five hundred sixty-eight".