16663946 has 16 divisors (see below), whose sum is σ = 27075048. Its totient is φ = 7646400.

The previous prime is 16663883. The next prime is 16663963. The reversal of 16663946 is 64936661.

It can be written as a sum of positive squares in 4 ways, for example, as 5340721 + 11323225 = 2311^2 + 3365^2 .

It is a Curzon number.

It is an unprimeable number.

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, 2936 + ... + 6476.

Almost surely, 2^16663946 is an apocalyptic number.

16663946 is a deficient number, since it is larger than the sum of its proper divisors (10411102).

16663946 is a wasteful number, since it uses less digits than its factorization.

16663946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3737.

The product of its digits is 139968, while the sum is 41.

The square root of 16663946 is about 4082.1496787845. The cubic root of 16663946 is about 255.4225775580.

The spelling of 16663946 in words is "sixteen million, six hundred sixty-three thousand, nine hundred forty-six".