18444064616 has 8 divisors (see below), whose sum is σ = 34582621170. Its totient is φ = 9222032304.

The previous prime is 18444064589. The next prime is 18444064627. The reversal of 18444064616 is 61646044481.

It can be written as a sum of positive squares in only one way, i.e., 16980696100 + 1463368516 = 130310^2 + 38254^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1152754031 + ... + 1152754046.

Almost surely, 2^18444064616 is an apocalyptic number.

It is an amenable number.

18444064616 is a deficient number, since it is larger than the sum of its proper divisors (16138556554).

18444064616 is a wasteful number, since it uses less digits than its factorization.

18444064616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2305508083 (or 2305508079 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 44.

The spelling of 18444064616 in words is "eighteen billion, four hundred forty-four million, sixty-four thousand, six hundred sixteen".