16666372 has 6 divisors (see below), whose sum is σ = 29166158. Its totient is φ = 8333184.

The previous prime is 16666369. The next prime is 16666381. The reversal of 16666372 is 27366661.

It can be written as a sum of positive squares in only one way, i.e., 15634116 + 1032256 = 3954^2 + 1016^2 .

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 as a sum of consecutive naturals, namely, 2083293 + ... + 2083300.

Almost surely, 2^16666372 is an apocalyptic number.

It is an amenable number.

16666372 is a deficient number, since it is larger than the sum of its proper divisors (12499786).

16666372 is a wasteful number, since it uses less digits than its factorization.

16666372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4166597 (or 4166595 counting only the distinct ones).

The product of its digits is 54432, while the sum is 37.

The square root of 16666372 is about 4082.4468153302. The cubic root of 16666372 is about 255.4349720833.

The spelling of 16666372 in words is "sixteen million, six hundred sixty-six thousand, three hundred seventy-two".