18383745664 has 16 divisors (see below), whose sum is σ = 36623868570. Its totient is φ = 9191872768.

The previous prime is 18383745637. The next prime is 18383745671. The reversal of 18383745664 is 46654738381.

It can be written as a sum of positive squares in only one way, i.e., 11835699264 + 6548046400 = 108792^2 + 80920^2 .

It is a tau number, because it is divible by the number of its divisors (16).

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 as a sum of consecutive naturals, namely, 71811379 + ... + 71811634.

Almost surely, 2^18383745664 is an apocalyptic number.

It is an amenable number.

18383745664 is a deficient number, since it is larger than the sum of its proper divisors (18240122906).

18383745664 is an equidigital number, since it uses as much as digits as its factorization.

18383745664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143623027 (or 143623015 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 55.

The spelling of 18383745664 in words is "eighteen billion, three hundred eighty-three million, seven hundred forty-five thousand, six hundred sixty-four".