16664989 has 8 divisors (see below), whose sum is σ = 18400032. Its totient is φ = 14966640.

The previous prime is 16664953. The next prime is 16665001. The reversal of 16664989 is 98946661.

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 16664989 - 2⁷ = 16664861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16664939) 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, 8214 + ... + 10039.

It is an arithmetic number, because the mean of its divisors is an integer number (2300004).

Almost surely, 2^16664989 is an apocalyptic number.

It is an amenable number.

16664989 is a deficient number, since it is larger than the sum of its proper divisors (1735043).

16664989 is a wasteful number, since it uses less digits than its factorization.

16664989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18347.

The product of its digits is 559872, while the sum is 49.

The square root of 16664989 is about 4082.2774281031. The cubic root of 16664989 is about 255.4279064317.

The spelling of 16664989 in words is "sixteen million, six hundred sixty-four thousand, nine hundred eighty-nine".