18043644404 has 6 divisors (see below), whose sum is σ = 31576377714. Its totient is φ = 9021822200.

The previous prime is 18043644373. The next prime is 18043644461. The reversal of 18043644404 is 40444634081.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16782684304 + 1260960100 = 129548^2 + 35510^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2255455547 + ... + 2255455554.

It is an arithmetic number, because the mean of its divisors is an integer number (5262729619).

Almost surely, 2^18043644404 is an apocalyptic number.

It is an amenable number.

18043644404 is a deficient number, since it is larger than the sum of its proper divisors (13532733310).

18043644404 is a wasteful number, since it uses less digits than its factorization.

18043644404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4510911105 (or 4510911103 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 38.

The spelling of 18043644404 in words is "eighteen billion, forty-three million, six hundred forty-four thousand, four hundred four".