16662213 has 8 divisors (see below), whose sum is σ = 24684800. Its totient is φ = 11108124.

The previous prime is 16662203. The next prime is 16662229. The reversal of 16662213 is 31226661.

It is not a de Polignac number, because 16662213 - 2⁴ = 16662197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 617119 = 16662213 / (1 + 6 + 6 + 6 + 2 + 2 + 1 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16662203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308533 + ... + 308586.

It is an arithmetic number, because the mean of its divisors is an integer number (3085600).

Almost surely, 2^16662213 is an apocalyptic number.

It is an amenable number.

16662213 is a deficient number, since it is larger than the sum of its proper divisors (8022587).

16662213 is an equidigital number, since it uses as much as digits as its factorization.

16662213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617128 (or 617122 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 16662213 is about 4081.9374076534. The cubic root of 16662213 is about 255.4137228591.

Adding to 16662213 its reverse (31226661), we get a palindrome (47888874).

The spelling of 16662213 in words is "sixteen million, six hundred sixty-two thousand, two hundred thirteen".