18155928209 has 24 divisors (see below), whose sum is σ = 20368393920. Its totient is φ = 16147560704.

The previous prime is 18155928179. The next prime is 18155928299. The reversal of 18155928209 is 90282955181.

It is not a de Polignac number, because 18155928209 - 2⁸ = 18155927953 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18155928299) 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 23 ways as a sum of consecutive naturals, for example, 535247 + ... + 568155.

It is an arithmetic number, because the mean of its divisors is an integer number (848683080).

Almost surely, 2^18155928209 is an apocalyptic number.

It is an amenable number.

18155928209 is a deficient number, since it is larger than the sum of its proper divisors (2212465711).

18155928209 is a wasteful number, since it uses less digits than its factorization.

18155928209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33049 (or 33032 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 50.

The spelling of 18155928209 in words is "eighteen billion, one hundred fifty-five million, nine hundred twenty-eight thousand, two hundred nine".