18543638016 has 80 divisors (see below), whose sum is σ = 54890497200. Its totient is φ = 6181208064.

The previous prime is 18543637999. The next prime is 18543638017. The reversal of 18543638016 is 61083634581.

18543638016 is a `hidden beast` number, since 1 + 8 + 5 + 4 + 3 + 638 + 0 + 1 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18543638017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 656881 + ... + 684528.

It is an arithmetic number, because the mean of its divisors is an integer number (686131215).

Almost surely, 2^18543638016 is an apocalyptic number.

18543638016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18543638016 is an abundant number, since it is smaller than the sum of its proper divisors (36346859184).

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

18543638016 is an equidigital number, since it uses as much as digits as its factorization.

18543638016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341436 (or 1341414 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 18543638016 in words is "eighteen billion, five hundred forty-three million, six hundred thirty-eight thousand, sixteen".