18944055609 has 8 divisors (see below), whose sum is σ = 25364426880. Its totient is φ = 12576527376.

The previous prime is 18944055589. The next prime is 18944055631. The reversal of 18944055609 is 90655044981.

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

It is not a de Polignac number, because 18944055609 - 2¹² = 18944051513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18944055709) 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 7 ways as a sum of consecutive naturals, for example, 13209922 + ... + 13211355.

It is an arithmetic number, because the mean of its divisors is an integer number (3170553360).

Almost surely, 2^18944055609 is an apocalyptic number.

It is an amenable number.

18944055609 is a deficient number, since it is larger than the sum of its proper divisors (6420371271).

18944055609 is a wasteful number, since it uses less digits than its factorization.

18944055609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26421519.

The product of its (nonzero) digits is 1555200, while the sum is 51.

The spelling of 18944055609 in words is "eighteen billion, nine hundred forty-four million, fifty-five thousand, six hundred nine".