18544038912 has 660 divisors, whose sum is σ = 68282352160. Its totient is φ = 4897013760.

The previous prime is 18544038881. The next prime is 18544038959. The reversal of 18544038912 is 21983044581.

18544038912 is a `hidden beast` number, since 18 + 544 + 0 + 3 + 8 + 91 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 452293612 + ... + 452293652.

Almost surely, 2^18544038912 is an apocalyptic number.

18544038912 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 18544038912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34141176080).

18544038912 is an abundant number, since it is smaller than the sum of its proper divisors (49738313248).

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

18544038912 is an equidigital number, since it uses as much as digits as its factorization.

18544038912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 18544038912 in words is "eighteen billion, five hundred forty-four million, thirty-eight thousand, nine hundred twelve".