6666213 has 4 divisors (see below), whose sum is σ = 8888288. Its totient is φ = 4444140.

The previous prime is 6666203. The next prime is 6666223. The reversal of 6666213 is 3126666.

6666213 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 an interprime number because it is at equal distance from previous prime (6666203) and next prime (6666223).

It is not a de Polignac number, because 6666213 - 2¹⁶ = 6600677 is a prime.

It is a super-2 number, since 2×6666213² = 88876791522738, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666203) 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, 1111033 + ... + 1111038.

It is an arithmetic number, because the mean of its divisors is an integer number (2222072).

Almost surely, 2^6666213 is an apocalyptic number.

It is an amenable number.

6666213 is a deficient number, since it is larger than the sum of its proper divisors (2222075).

6666213 is a wasteful number, since it uses less digits than its factorization.

6666213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222074.

The product of its digits is 7776, while the sum is 30.

The square root of 6666213 is about 2581.9010438047. The cubic root of 6666213 is about 188.2029365126.

The spelling of 6666213 in words is "six million, six hundred sixty-six thousand, two hundred thirteen".