18327664640 has 192 divisors, whose sum is σ = 46985702400. Its totient is φ = 6837239808.

The previous prime is 18327664633. The next prime is 18327664681. The reversal of 18327664640 is 4646672381.

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, 22107746 + ... + 22108574.

It is an arithmetic number, because the mean of its divisors is an integer number (244717200).

Almost surely, 2^18327664640 is an apocalyptic number.

18327664640 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 18327664640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23492851200).

18327664640 is an abundant number, since it is smaller than the sum of its proper divisors (28658037760).

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

18327664640 is a wasteful number, since it uses less digits than its factorization.

18327664640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000 (or 980 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 47.

The spelling of 18327664640 in words is "eighteen billion, three hundred twenty-seven million, six hundred sixty-four thousand, six hundred forty".