16566223 has 4 divisors (see below), whose sum is σ = 16951528. Its totient is φ = 16180920.

The previous prime is 16566203. The next prime is 16566229. The reversal of 16566223 is 32266561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16566223 - 2⁵ = 16566191 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16566229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192588 + ... + 192673.

It is an arithmetic number, because the mean of its divisors is an integer number (4237882).

Almost surely, 2^16566223 is an apocalyptic number.

16566223 is a deficient number, since it is larger than the sum of its proper divisors (385305).

16566223 is an equidigital number, since it uses as much as digits as its factorization.

16566223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385304.

The product of its digits is 12960, while the sum is 31.

The square root of 16566223 is about 4070.1625274674. The cubic root of 16566223 is about 254.9223036390.

The spelling of 16566223 in words is "sixteen million, five hundred sixty-six thousand, two hundred twenty-three".