18338883381 has 128 divisors (see below), whose sum is σ = 34825728000. Its totient is φ = 9276519168.

The previous prime is 18338883289. The next prime is 18338883421.

18338883381 is a `hidden beast` number, since 183 + 3 + 8 + 8 + 83 + 381 = 666.

18338883381 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18338883381 - 2⁷ = 18338883253 is a prime.

It is a super-2 number, since 2×18338883381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18338893381) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 11613450 + ... + 11615028.

It is an arithmetic number, because the mean of its divisors is an integer number (272076000).

Almost surely, 2^18338883381 is an apocalyptic number.

It is an amenable number.

18338883381 is a deficient number, since it is larger than the sum of its proper divisors (16486844619).

18338883381 is a wasteful number, since it uses less digits than its factorization.

18338883381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1800 (or 1794 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 54.

The spelling of 18338883381 in words is "eighteen billion, three hundred thirty-eight million, eight hundred eighty-three thousand, three hundred eighty-one".