18209908617 has 32 divisors (see below), whose sum is σ = 26575134720. Its totient is φ = 11048607360.

The previous prime is 18209908601. The next prime is 18209908709. The reversal of 18209908617 is 71680990281.

It is not a de Polignac number, because 18209908617 - 2⁴ = 18209908601 is a prime.

It is a super-3 number, since 3×18209908617³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18209908617.

It is not an unprimeable number, because it can be changed into a prime (18209908517) 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 31 ways as a sum of consecutive naturals, for example, 204468 + ... + 279690.

It is an arithmetic number, because the mean of its divisors is an integer number (830472960).

Almost surely, 2^18209908617 is an apocalyptic number.

It is an amenable number.

18209908617 is a deficient number, since it is larger than the sum of its proper divisors (8365226103).

18209908617 is a wasteful number, since it uses less digits than its factorization.

18209908617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75413.

The product of its (nonzero) digits is 435456, while the sum is 51.

The spelling of 18209908617 in words is "eighteen billion, two hundred nine million, nine hundred eight thousand, six hundred seventeen".