16664644 has 12 divisors (see below), whose sum is σ = 29199100. Its totient is φ = 8322048.

The previous prime is 16664629. The next prime is 16664663. The reversal of 16664644 is 44646661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7128900 + 9535744 = 2670^2 + 3088^2 .

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 3 ways as a sum of consecutive naturals, for example, 1972 + ... + 6100.

Almost surely, 2^16664644 is an apocalyptic number.

It is an amenable number.

16664644 is a deficient number, since it is larger than the sum of its proper divisors (12534456).

16664644 is a wasteful number, since it uses less digits than its factorization.

16664644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5142 (or 5140 counting only the distinct ones).

The product of its digits is 82944, while the sum is 37.

The square root of 16664644 is about 4082.2351720595. The cubic root of 16664644 is about 255.4261437895.

The spelling of 16664644 in words is "sixteen million, six hundred sixty-four thousand, six hundred forty-four".