16660213 has 4 divisors (see below), whose sum is σ = 16708300. Its totient is φ = 16612128.

The previous prime is 16660157. The next prime is 16660219. The reversal of 16660213 is 31206661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31206661 = 1747 ⋅17863.

It can be written as a sum of positive squares in 2 ways, for example, as 5750404 + 10909809 = 2398^2 + 3303^2 .

It is a cyclic number.

It is not a de Polignac number, because 16660213 - 2²¹ = 14563061 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 (16660219) 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, 23520 + ... + 24217.

It is an arithmetic number, because the mean of its divisors is an integer number (4177075).

Almost surely, 2^16660213 is an apocalyptic number.

It is an amenable number.

16660213 is a deficient number, since it is larger than the sum of its proper divisors (48087).

16660213 is an equidigital number, since it uses as much as digits as its factorization.

16660213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48086.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 16660213 is about 4081.6924185931. The cubic root of 16660213 is about 255.4035031704.

Adding to 16660213 its reverse (31206661), we get a palindrome (47866874).

The spelling of 16660213 in words is "sixteen million, six hundred sixty thousand, two hundred thirteen".