16649866 has 8 divisors (see below), whose sum is σ = 25119684. Its totient is φ = 8276640.

The previous prime is 16649839. The next prime is 16649879. The reversal of 16649866 is 66894661.

It can be written as a sum of positive squares in 2 ways, for example, as 14630625 + 2019241 = 3825^2 + 1421^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 23715 + ... + 24406.

Almost surely, 2^16649866 is an apocalyptic number.

16649866 is a deficient number, since it is larger than the sum of its proper divisors (8469818).

16649866 is a wasteful number, since it uses less digits than its factorization.

16649866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48296.

The product of its digits is 373248, while the sum is 46.

The square root of 16649866 is about 4080.4247327944. The cubic root of 16649866 is about 255.3506185461.

The spelling of 16649866 in words is "sixteen million, six hundred forty-nine thousand, eight hundred sixty-six".