16668289 has 8 divisors (see below), whose sum is σ = 18414720. Its totient is φ = 14960400.

The previous prime is 16668287. The next prime is 16668299. The reversal of 16668289 is 98286661.

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

It is a cyclic number.

It is not a de Polignac number, because 16668289 - 2¹ = 16668287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16668287) 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 7 ways as a sum of consecutive naturals, for example, 8722 + ... + 10459.

It is an arithmetic number, because the mean of its divisors is an integer number (2301840).

Almost surely, 2^16668289 is an apocalyptic number.

It is an amenable number.

16668289 is a deficient number, since it is larger than the sum of its proper divisors (1746431).

16668289 is a wasteful number, since it uses less digits than its factorization.

16668289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19271.

The product of its digits is 248832, while the sum is 46.

The square root of 16668289 is about 4082.6815942466. The cubic root of 16668289 is about 255.4447652579. Note that the first 3 decimals are identical.

The spelling of 16668289 in words is "sixteen million, six hundred sixty-eight thousand, two hundred eighty-nine".