18681044320 has 96 divisors (see below), whose sum is σ = 46815003648. Its totient is φ = 7020085248.

The previous prime is 18681044311. The next prime is 18681044351. The reversal of 18681044320 is 2344018681.

It is a self number, because there is not a number n which added to its sum of digits gives 18681044320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1563489 + ... + 1575391.

It is an arithmetic number, because the mean of its divisors is an integer number (487656288).

Almost surely, 2^18681044320 is an apocalyptic number.

18681044320 is a gapful number since it is divisible by the number (10) 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 18681044320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23407501824).

18681044320 is an abundant number, since it is smaller than the sum of its proper divisors (28133959328).

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

18681044320 is a wasteful number, since it uses less digits than its factorization.

18681044320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12512 (or 12504 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The spelling of 18681044320 in words is "eighteen billion, six hundred eighty-one million, forty-four thousand, three hundred twenty".