16566216 has 16 divisors (see below), whose sum is σ = 41415600. Its totient is φ = 5522064.

The previous prime is 16566203. The next prime is 16566229. The reversal of 16566216 is 61266561.

It is an interprime number because it is at equal distance from previous prime (16566203) and next prime (16566229).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345106 + ... + 345153.

It is an arithmetic number, because the mean of its divisors is an integer number (2588475).

Almost surely, 2^16566216 is an apocalyptic number.

It is an amenable number.

16566216 is an abundant number, since it is smaller than the sum of its proper divisors (24849384).

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

16566216 is a wasteful number, since it uses less digits than its factorization.

16566216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690268 (or 690264 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 16566216 is about 4070.1616675508. The cubic root of 16566216 is about 254.9222677335.

The spelling of 16566216 in words is "sixteen million, five hundred sixty-six thousand, two hundred sixteen".