16566213 has 4 divisors (see below), whose sum is σ = 22088288. Its totient is φ = 11044140.

The previous prime is 16566203. The next prime is 16566229. The reversal of 16566213 is 31266561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 16566213 - 2⁵ = 16566181 is a prime.

It is a super-2 number, since 2×16566213² = 548878826322738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16566203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2761033 + ... + 2761038.

It is an arithmetic number, because the mean of its divisors is an integer number (5522072).

Almost surely, 2^16566213 is an apocalyptic number.

It is an amenable number.

16566213 is a deficient number, since it is larger than the sum of its proper divisors (5522075).

16566213 is an equidigital number, since it uses as much as digits as its factorization.

16566213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5522074.

The product of its digits is 6480, while the sum is 30.

The square root of 16566213 is about 4070.1612990151. The cubic root of 16566213 is about 254.9222523454.

The spelling of 16566213 in words is "sixteen million, five hundred sixty-six thousand, two hundred thirteen".