18538909464 has 16 divisors (see below), whose sum is σ = 46347273720. Its totient is φ = 6179636480.

The previous prime is 18538909409. The next prime is 18538909511. The reversal of 18538909464 is 46490983581.

It is a super-2 number, since 2×18538909464² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386227257 + ... + 386227304.

Almost surely, 2^18538909464 is an apocalyptic number.

It is an amenable number.

18538909464 is an abundant number, since it is smaller than the sum of its proper divisors (27808364256).

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

18538909464 is a wasteful number, since it uses less digits than its factorization.

18538909464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772454570 (or 772454566 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 57.

The spelling of 18538909464 in words is "eighteen billion, five hundred thirty-eight million, nine hundred nine thousand, four hundred sixty-four".