66215323 has 16 divisors (see below), whose sum is σ = 76356000. Its totient is φ = 56996352.

The previous prime is 66215309. The next prime is 66215329. The reversal of 66215323 is 32351266.

It is a de Polignac number, because none of the positive numbers 2^k-66215323 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66215291 and 66215300.

It is not an unprimeable number, because it can be changed into a prime (66215329) 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 15 ways as a sum of consecutive naturals, for example, 5833 + ... + 12901.

It is an arithmetic number, because the mean of its divisors is an integer number (4772250).

Almost surely, 2^66215323 is an apocalyptic number.

66215323 is a deficient number, since it is larger than the sum of its proper divisors (10140677).

66215323 is a wasteful number, since it uses less digits than its factorization.

66215323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7134.

The product of its digits is 6480, while the sum is 28.

The square root of 66215323 is about 8137.2798280506. The cubic root of 66215323 is about 404.5630057659.

Adding to 66215323 its reverse (32351266), we get a palindrome (98566589).

The spelling of 66215323 in words is "sixty-six million, two hundred fifteen thousand, three hundred twenty-three".