18256818838 has 32 divisors (see below), whose sum is σ = 29471869440. Its totient is φ = 8454774240.

The previous prime is 18256818829. The next prime is 18256818847. The reversal of 18256818838 is 83881865281.

It is an interprime number because it is at equal distance from previous prime (18256818829) and next prime (18256818847).

It is a super-2 number, since 2×18256818838² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1804173 + ... + 1814263.

It is an arithmetic number, because the mean of its divisors is an integer number (920995920).

Almost surely, 2^18256818838 is an apocalyptic number.

18256818838 is a deficient number, since it is larger than the sum of its proper divisors (11215050602).

18256818838 is a wasteful number, since it uses less digits than its factorization.

18256818838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11172.

The product of its digits is 5898240, while the sum is 58.

The spelling of 18256818838 in words is "eighteen billion, two hundred fifty-six million, eight hundred eighteen thousand, eight hundred thirty-eight".