66631323 has 8 divisors (see below), whose sum is σ = 96918336. Its totient is φ = 40382600.

The previous prime is 66631319. The next prime is 66631343. The reversal of 66631323 is 32313666.

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

It is a cyclic number.

It is not a de Polignac number, because 66631323 - 2² = 66631319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66631343) 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, 1009533 + ... + 1009598.

It is an arithmetic number, because the mean of its divisors is an integer number (12114792).

Almost surely, 2^66631323 is an apocalyptic number.

66631323 is a deficient number, since it is larger than the sum of its proper divisors (30287013).

66631323 is a wasteful number, since it uses less digits than its factorization.

66631323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2019145.

The product of its digits is 11664, while the sum is 30.

The square root of 66631323 is about 8162.8011736168. The cubic root of 66631323 is about 405.4084645983.

Adding to 66631323 its reverse (32313666), we get a palindrome (98944989).

The spelling of 66631323 in words is "sixty-six million, six hundred thirty-one thousand, three hundred twenty-three".