18538520022 has 48 divisors (see below), whose sum is σ = 43919720208. Its totient is φ = 5604733440.

The previous prime is 18538519973. The next prime is 18538520027. The reversal of 18538520022 is 22002583581.

18538520022 is a `hidden beast` number, since 1 + 85 + 38 + 520 + 0 + 22 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18538520027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22383 + ... + 193850.

It is an arithmetic number, because the mean of its divisors is an integer number (914994171).

Almost surely, 2^18538520022 is an apocalyptic number.

18538520022 is an abundant number, since it is smaller than the sum of its proper divisors (25381200186).

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

18538520022 is a wasteful number, since it uses less digits than its factorization.

18538520022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216685 (or 216682 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The spelling of 18538520022 in words is "eighteen billion, five hundred thirty-eight million, five hundred twenty thousand, twenty-two".