16666223 has 6 divisors (see below), whose sum is σ = 19387296. Its totient is φ = 14285292.

The previous prime is 16666219. The next prime is 16666231. The reversal of 16666223 is 32266661.

It is not a de Polignac number, because 16666223 - 2² = 16666219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16666223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16666423) 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 5 ways as a sum of consecutive naturals, for example, 170015 + ... + 170112.

It is an arithmetic number, because the mean of its divisors is an integer number (3231216).

Almost surely, 2^16666223 is an apocalyptic number.

16666223 is a deficient number, since it is larger than the sum of its proper divisors (2721073).

16666223 is an equidigital number, since it uses as much as digits as its factorization.

16666223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340141 (or 340134 counting only the distinct ones).

The product of its digits is 15552, while the sum is 32.

The square root of 16666223 is about 4082.4285664295. The cubic root of 16666223 is about 255.4342108714.

The spelling of 16666223 in words is "sixteen million, six hundred sixty-six thousand, two hundred twenty-three".