66505323 has 16 divisors (see below), whose sum is σ = 94694400. Its totient is φ = 41425440.

The previous prime is 66505319. The next prime is 66505337. The reversal of 66505323 is 32350566.

It is not a de Polignac number, because 66505323 - 2² = 66505319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66505303) 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, 9633 + ... + 15026.

It is an arithmetic number, because the mean of its divisors is an integer number (5918400).

Almost surely, 2^66505323 is an apocalyptic number.

66505323 is a deficient number, since it is larger than the sum of its proper divisors (28189077).

66505323 is a wasteful number, since it uses less digits than its factorization.

66505323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24722.

The product of its (nonzero) digits is 16200, while the sum is 30.

The square root of 66505323 is about 8155.0795826896. The cubic root of 66505323 is about 405.1527605415.

Adding to 66505323 its reverse (32350566), we get a palindrome (98855889).

The spelling of 66505323 in words is "sixty-six million, five hundred five thousand, three hundred twenty-three".