18011538937808 has 160 divisors (see below), whose sum is σ = 38420994648960. Its totient is φ = 8129040353280.

The previous prime is 18011538937687. The next prime is 18011538937813. The reversal of 18011538937808 is 80873983511081.

It is a hoax number, since the sum of its digits (62) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5446487291 + ... + 5446490597.

It is an arithmetic number, because the mean of its divisors is an integer number (240131216556).

Almost surely, 2^{18011538937808} 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 18011538937808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19210497324480).

18011538937808 is an abundant number, since it is smaller than the sum of its proper divisors (20409455711152).

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

18011538937808 is a wasteful number, since it uses less digits than its factorization.

18011538937808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5765 (or 5759 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 62.

The spelling of 18011538937808 in words is "eighteen trillion, eleven billion, five hundred thirty-eight million, nine hundred thirty-seven thousand, eight hundred eight".