18418821884 has 12 divisors (see below), whose sum is σ = 32237116464. Its totient is φ = 9208217184.

The previous prime is 18418821877. The next prime is 18418821893. The reversal of 18418821884 is 48812881481.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 263264 + ... + 325799.

It is an arithmetic number, because the mean of its divisors is an integer number (2686426372).

Almost surely, 2^18418821884 is an apocalyptic number.

It is an amenable number.

18418821884 is a deficient number, since it is larger than the sum of its proper divisors (13818294580).

18418821884 is a wasteful number, since it uses less digits than its factorization.

18418821884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596884 (or 596882 counting only the distinct ones).

The product of its digits is 1048576, while the sum is 53.

The spelling of 18418821884 in words is "eighteen billion, four hundred eighteen million, eight hundred twenty-one thousand, eight hundred eighty-four".