18718635144 has 48 divisors (see below), whose sum is σ = 51437579760. Its totient is φ = 5672312800.

The previous prime is 18718635139. The next prime is 18718635161. The reversal of 18718635144 is 44153681781.

It is a junction number, because it is equal to n+sod(n) for n = 18718635093 and 18718635102.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3220002 + ... + 3225809.

It is an arithmetic number, because the mean of its divisors is an integer number (1071616245).

Almost surely, 2^18718635144 is an apocalyptic number.

It is an amenable number.

18718635144 is an abundant number, since it is smaller than the sum of its proper divisors (32718944616).

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

18718635144 is a wasteful number, since it uses less digits than its factorization.

18718635144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6445842 (or 6445827 counting only the distinct ones).

The product of its digits is 645120, while the sum is 48.

The spelling of 18718635144 in words is "eighteen billion, seven hundred eighteen million, six hundred thirty-five thousand, one hundred forty-four".