18216866995584 has 256 divisors, whose sum is σ = 49181807404800. Its totient is φ = 5973434818560.

The previous prime is 18216866995529. The next prime is 18216866995669. The reversal of 18216866995584 is 48559966861281.

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, 9788750814 + ... + 9788752674.

It is an arithmetic number, because the mean of its divisors is an integer number (192116435175).

Almost surely, 2^{18216866995584} 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 18216866995584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24590903702400).

18216866995584 is an abundant number, since it is smaller than the sum of its proper divisors (30964940409216).

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

18216866995584 is a wasteful number, since it uses less digits than its factorization.

18216866995584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3113 (or 3101 counting only the distinct ones).

The product of its digits is 1791590400, while the sum is 78.

The spelling of 18216866995584 in words is "eighteen trillion, two hundred sixteen billion, eight hundred sixty-six million, nine hundred ninety-five thousand, five hundred eighty-four".