18874145538 has 24 divisors (see below), whose sum is σ = 40931100288. Its totient is φ = 6285671352.

The previous prime is 18874145527. The next prime is 18874145567. The reversal of 18874145538 is 83554147881.

18874145538 is a `hidden beast` number, since 1 + 8 + 8 + 74 + 14 + 553 + 8 = 666.

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, 455470 + ... + 495177.

It is an arithmetic number, because the mean of its divisors is an integer number (1705462512).

Almost surely, 2^18874145538 is an apocalyptic number.

18874145538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18874145538 is an abundant number, since it is smaller than the sum of its proper divisors (22056954750).

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

18874145538 is a wasteful number, since it uses less digits than its factorization.

18874145538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951758 (or 951755 counting only the distinct ones).

The product of its digits is 4300800, while the sum is 54.

The spelling of 18874145538 in words is "eighteen billion, eight hundred seventy-four million, one hundred forty-five thousand, five hundred thirty-eight".