18944643235 has 8 divisors (see below), whose sum is σ = 25981225056. Its totient is φ = 12990612480.

The previous prime is 18944643217. The next prime is 18944643241. The reversal of 18944643235 is 53234644981.

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

It is not a de Polignac number, because 18944643235 - 2⁵ = 18944643203 is a prime.

It is a Duffinian number.

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 in 7 ways as a sum of consecutive naturals, for example, 270637726 + ... + 270637795.

It is an arithmetic number, because the mean of its divisors is an integer number (3247653132).

Almost surely, 2^18944643235 is an apocalyptic number.

18944643235 is a deficient number, since it is larger than the sum of its proper divisors (7036581821).

18944643235 is an equidigital number, since it uses as much as digits as its factorization.

18944643235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541275533.

The product of its digits is 2488320, while the sum is 49.

The spelling of 18944643235 in words is "eighteen billion, nine hundred forty-four million, six hundred forty-three thousand, two hundred thirty-five".