17968598209 has 3 divisors (see below), whose sum is σ = 17968732257. Its totient is φ = 17968464162.

The previous prime is 17968598201. The next prime is 17968598251. The reversal of 17968598209 is 90289586971.

The square root of 17968598209 is 134047.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90289586971 = 173 ⋅521905127.

It is not a de Polignac number, because 17968598209 - 2³ = 17968598201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17968598201) 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 2 ways as a sum of consecutive naturals, for example, 67024 + ... + 201070.

It is an arithmetic number, because the mean of its divisors is an integer number (5989577419).

Almost surely, 2^17968598209 is an apocalyptic number.

17968598209 is the 134047-th square number.

17968598209 is the 67024-th centered octagonal number.

It is an amenable number.

17968598209 is a deficient number, since it is larger than the sum of its proper divisors (134048).

17968598209 is an frugal number, since it uses more digits than its factorization.

17968598209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268094 (or 134047 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 64.

Multiplying 17968598209 by its sum of digits (64), we get a square (1149990285376 = 1072376²).

The spelling of 17968598209 in words is "seventeen billion, nine hundred sixty-eight million, five hundred ninety-eight thousand, two hundred nine".