18005371538 has 24 divisors (see below), whose sum is σ = 34273677744. Its totient is φ = 7015079400.

The previous prime is 18005371513. The next prime is 18005371541. The reversal of 18005371538 is 83517350081.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18005371495 and 18005371504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8350208 + ... + 8352363.

It is an arithmetic number, because the mean of its divisors is an integer number (1428069906).

Almost surely, 2^18005371538 is an apocalyptic number.

18005371538 is a deficient number, since it is larger than the sum of its proper divisors (16268306206).

18005371538 is a wasteful number, since it uses less digits than its factorization.

18005371538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16702598 (or 16702591 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 41.

The spelling of 18005371538 in words is "eighteen billion, five million, three hundred seventy-one thousand, five hundred thirty-eight".