18665845632 has 256 divisors, whose sum is σ = 66275520000. Its totient is φ = 5052284928.

The previous prime is 18665845603. The next prime is 18665845663. The reversal of 18665845632 is 23654856681.

18665845632 is a `hidden beast` number, since 1 + 8 + 6 + 6 + 584 + 56 + 3 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 439344 + ... + 479952.

It is an arithmetic number, because the mean of its divisors is an integer number (258888750).

Almost surely, 2^18665845632 is an apocalyptic number.

18665845632 is a gapful number since it is divisible by the number (12) 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 18665845632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33137760000).

18665845632 is an abundant number, since it is smaller than the sum of its proper divisors (47609674368).

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

18665845632 is a wasteful number, since it uses less digits than its factorization.

18665845632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40658 (or 40640 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 54.

The spelling of 18665845632 in words is "eighteen billion, six hundred sixty-five million, eight hundred forty-five thousand, six hundred thirty-two".