18538247464 has 16 divisors (see below), whose sum is σ = 37919142720. Its totient is φ = 8426476080.

The previous prime is 18538247461. The next prime is 18538247489. The reversal of 18538247464 is 46474283581.

It is not an unprimeable number, because it can be changed into a prime (18538247461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105330864 + ... + 105331039.

It is an arithmetic number, because the mean of its divisors is an integer number (2369946420).

Almost surely, 2^18538247464 is an apocalyptic number.

It is an amenable number.

18538247464 is an abundant number, since it is smaller than the sum of its proper divisors (19380895256).

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

18538247464 is a wasteful number, since it uses less digits than its factorization.

18538247464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210661920 (or 210661916 counting only the distinct ones).

The product of its digits is 5160960, while the sum is 52.

The spelling of 18538247464 in words is "eighteen billion, five hundred thirty-eight million, two hundred forty-seven thousand, four hundred sixty-four".