66231213 has 8 divisors (see below), whose sum is σ = 88652928. Its totient is φ = 43981824.

The previous prime is 66231161. The next prime is 66231229. The reversal of 66231213 is 31213266.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66231213 - 2⁶ = 66231149 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 (66231233) 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 7 ways as a sum of consecutive naturals, for example, 42181 + ... + 43722.

It is an arithmetic number, because the mean of its divisors is an integer number (11081616).

Almost surely, 2^66231213 is an apocalyptic number.

It is an amenable number.

66231213 is a deficient number, since it is larger than the sum of its proper divisors (22421715).

66231213 is a wasteful number, since it uses less digits than its factorization.

66231213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86163.

The product of its digits is 1296, while the sum is 24.

The square root of 66231213 is about 8138.2561399848. The cubic root of 66231213 is about 404.5953648016.

Adding to 66231213 its reverse (31213266), we get a palindrome (97444479).

The spelling of 66231213 in words is "sixty-six million, two hundred thirty-one thousand, two hundred thirteen".