16664705 has 16 divisors (see below), whose sum is σ = 20811600. Its totient is φ = 12794880.

The previous prime is 16664677. The next prime is 16664731. The reversal of 16664705 is 50746661.

It can be written as a sum of positive squares in 8 ways, for example, as 1227664 + 15437041 = 1108^2 + 3929^2 .

It is not a de Polignac number, because 16664705 - 2¹⁰ = 16663681 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40541 + ... + 40949.

It is an arithmetic number, because the mean of its divisors is an integer number (1300725).

Almost surely, 2^16664705 is an apocalyptic number.

It is an amenable number.

16664705 is a deficient number, since it is larger than the sum of its proper divisors (4146895).

16664705 is a wasteful number, since it uses less digits than its factorization.

16664705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 16664705 is about 4082.2426434498. The cubic root of 16664705 is about 255.4264554468.

The spelling of 16664705 in words is "sixteen million, six hundred sixty-four thousand, seven hundred five".