18443905922 has 54 divisors (see below), whose sum is σ = 30667525947. Its totient is φ = 8315516352.

The previous prime is 18443905913. The next prime is 18443905927. The reversal of 18443905922 is 22950934481.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 73085401 + 18370820521 = 8549^2 + 135539^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=96031.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18443905927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 207234854 + ... + 207234942.

Almost surely, 2^18443905922 is an apocalyptic number.

18443905922 is a deficient number, since it is larger than the sum of its proper divisors (12223620025).

18443905922 is an frugal number, since it uses more digits than its factorization.

18443905922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 47.

The spelling of 18443905922 in words is "eighteen billion, four hundred forty-three million, nine hundred five thousand, nine hundred twenty-two".