18444943065 has 16 divisors (see below), whose sum is σ = 29522875968. Its totient is φ = 9833647296.

The previous prime is 18444943061. The next prime is 18444943073. The reversal of 18444943065 is 56034944481.

It is a happy number.

It is not a de Polignac number, because 18444943065 - 2² = 18444943061 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18444943061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186522 + ... + 267731.

It is an arithmetic number, because the mean of its divisors is an integer number (1845179748).

Almost surely, 2^18444943065 is an apocalyptic number.

18444943065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18444943065 is a deficient number, since it is larger than the sum of its proper divisors (11077932903).

18444943065 is a wasteful number, since it uses less digits than its factorization.

18444943065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456968.

The product of its (nonzero) digits is 1658880, while the sum is 48.

The spelling of 18444943065 in words is "eighteen billion, four hundred forty-four million, nine hundred forty-three thousand, sixty-five".