18944256009 has 8 divisors (see below), whose sum is σ = 28867437760. Its totient is φ = 10825289136.

The previous prime is 18944255989. The next prime is 18944256047. The reversal of 18944256009 is 90065244981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18944256009 - 2⁵ = 18944255977 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18944256509) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 451053694 + ... + 451053735.

It is an arithmetic number, because the mean of its divisors is an integer number (3608429720).

Almost surely, 2^18944256009 is an apocalyptic number.

It is an amenable number.

18944256009 is a deficient number, since it is larger than the sum of its proper divisors (9923181751).

18944256009 is an equidigital number, since it uses as much as digits as its factorization.

18944256009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902107439.

The product of its (nonzero) digits is 622080, while the sum is 48.

The spelling of 18944256009 in words is "eighteen billion, nine hundred forty-four million, two hundred fifty-six thousand, nine".