16909666 has 8 divisors (see below), whose sum is σ = 26050140. Its totient is φ = 8226288.

The previous prime is 16909643. The next prime is 16909667. The reversal of 16909666 is 66690961.

It can be written as a sum of positive squares in 2 ways, for example, as 11363641 + 5546025 = 3371^2 + 2355^2 .

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

It is not an unprimeable number, because it can be changed into a prime (16909667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114181 + ... + 114328.

Almost surely, 2^16909666 is an apocalyptic number.

16909666 is a deficient number, since it is larger than the sum of its proper divisors (9140474).

16909666 is a wasteful number, since it uses less digits than its factorization.

16909666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228548.

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 16909666 is about 4112.1364276979. The cubic root of 16909666 is about 256.6719104643.

The spelling of 16909666 in words is "sixteen million, nine hundred nine thousand, six hundred sixty-six".