66333213 has 12 divisors (see below), whose sum is σ = 96892380. Its totient is φ = 43724736.

The previous prime is 66333209. The next prime is 66333221. The reversal of 66333213 is 31233366.

66333213 is a `hidden beast` number, since 6 + 633 + 3 + 21 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 30008484 + 36324729 = 5478^2 + 6027^2 .

It is not a de Polignac number, because 66333213 - 2² = 66333209 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66333233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40606 + ... + 42207.

It is an arithmetic number, because the mean of its divisors is an integer number (8074365).

Almost surely, 2^66333213 is an apocalyptic number.

It is an amenable number.

66333213 is a deficient number, since it is larger than the sum of its proper divisors (30559167).

66333213 is a wasteful number, since it uses less digits than its factorization.

66333213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82908 (or 82905 counting only the distinct ones).

The product of its digits is 5832, while the sum is 27.

The square root of 66333213 is about 8144.5204278705. The cubic root of 66333213 is about 404.8029585630.

Adding to 66333213 its reverse (31233366), we get a palindrome (97566579).

The spelling of 66333213 in words is "sixty-six million, three hundred thirty-three thousand, two hundred thirteen".