18040973818 has 32 divisors (see below), whose sum is σ = 34170418944. Its totient is φ = 6960636672.

The previous prime is 18040973737. The next prime is 18040973857. The reversal of 18040973818 is 81837904081.

It is a super-2 number, since 2×18040973818² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1642405 + ... + 1653352.

It is an arithmetic number, because the mean of its divisors is an integer number (1067825592).

Almost surely, 2^18040973818 is an apocalyptic number.

18040973818 is a deficient number, since it is larger than the sum of its proper divisors (16129445126).

18040973818 is a wasteful number, since it uses less digits than its factorization.

18040973818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3295806.

The product of its (nonzero) digits is 387072, while the sum is 49.

The spelling of 18040973818 in words is "eighteen billion, forty million, nine hundred seventy-three thousand, eight hundred eighteen".