16668609 has 8 divisors (see below), whose sum is σ = 22244160. Its totient is φ = 11102736.

The previous prime is 16668569. The next prime is 16668647. The reversal of 16668609 is 90686661.

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

It is not a de Polignac number, because 16668609 - 2¹³ = 16660417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16668209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4159 + ... + 7115.

It is an arithmetic number, because the mean of its divisors is an integer number (2780520).

Almost surely, 2^16668609 is an apocalyptic number.

It is an amenable number.

16668609 is a deficient number, since it is larger than the sum of its proper divisors (5575551).

16668609 is a wasteful number, since it uses less digits than its factorization.

16668609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4839.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 16668609 is about 4082.7207839871. The cubic root of 16668609 is about 255.4463999348.

The spelling of 16668609 in words is "sixteen million, six hundred sixty-eight thousand, six hundred nine".