66323343599 has 4 divisors (see below), whose sum is σ = 66337185936. Its totient is φ = 66309501264.

The previous prime is 66323343587. The next prime is 66323343613. The reversal of 66323343599 is 99534332366.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66323343599 - 2²⁰ = 66322295023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66323343599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66323343799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6913979 + ... + 6923564.

It is an arithmetic number, because the mean of its divisors is an integer number (16584296484).

Almost surely, 2^66323343599 is an apocalyptic number.

66323343599 is a deficient number, since it is larger than the sum of its proper divisors (13842337).

66323343599 is a wasteful number, since it uses less digits than its factorization.

66323343599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13842336.

The product of its digits is 9447840, while the sum is 53.

The spelling of 66323343599 in words is "sixty-six billion, three hundred twenty-three million, three hundred forty-three thousand, five hundred ninety-nine".