16666644 has 12 divisors (see below), whose sum is σ = 38888864. Its totient is φ = 5555544.

The previous prime is 16666631. The next prime is 16666669. The reversal of 16666644 is 44666661.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 694432 + ... + 694455.

Almost surely, 2^16666644 is an apocalyptic number.

It is an amenable number.

16666644 is an abundant number, since it is smaller than the sum of its proper divisors (22222220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16666644 is a wasteful number, since it uses less digits than its factorization.

16666644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388894 (or 1388892 counting only the distinct ones).

The product of its digits is 124416, while the sum is 39.

The square root of 16666644 is about 4082.4801285493. The cubic root of 16666644 is about 255.4363616666.

The spelling of 16666644 in words is "sixteen million, six hundred sixty-six thousand, six hundred forty-four".