16645223 has 4 divisors (see below), whose sum is σ = 19023120. Its totient is φ = 14267328.

The previous prime is 16645219. The next prime is 16645247. The reversal of 16645223 is 32254661.

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 16645223 - 2² = 16645219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16645283) 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, 1188938 + ... + 1188951.

It is an arithmetic number, because the mean of its divisors is an integer number (4755780).

Almost surely, 2^16645223 is an apocalyptic number.

16645223 is a deficient number, since it is larger than the sum of its proper divisors (2377897).

16645223 is an equidigital number, since it uses as much as digits as its factorization.

16645223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2377896.

The product of its digits is 8640, while the sum is 29.

The square root of 16645223 is about 4079.8557572542. The cubic root of 16645223 is about 255.3268805543.

Adding to 16645223 its reverse (32254661), we get a palindrome (48899884).

The spelling of 16645223 in words is "sixteen million, six hundred forty-five thousand, two hundred twenty-three".