18168044208 has 80 divisors (see below), whose sum is σ = 48209652480. Its totient is φ = 5892509952.

The previous prime is 18168044201. The next prime is 18168044231. The reversal of 18168044208 is 80244086181.

It is a self number, because there is not a number n which added to its sum of digits gives 18168044208.

It is not an unprimeable number, because it can be changed into a prime (18168044201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 526098 + ... + 559566.

It is an arithmetic number, because the mean of its divisors is an integer number (602620656).

Almost surely, 2^18168044208 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 18168044208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24104826240).

18168044208 is an abundant number, since it is smaller than the sum of its proper divisors (30041608272).

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

18168044208 is a wasteful number, since it uses less digits than its factorization.

18168044208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33786 (or 33780 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 42.

The spelling of 18168044208 in words is "eighteen billion, one hundred sixty-eight million, forty-four thousand, two hundred eight".