66831323 has 4 divisors (see below), whose sum is σ = 71972208. Its totient is φ = 61690440.

The previous prime is 66831313. The next prime is 66831343. The reversal of 66831323 is 32313866.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66831323 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 66831323.

It is not an unprimeable number, because it can be changed into a prime (66831313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2570423 + ... + 2570448.

It is an arithmetic number, because the mean of its divisors is an integer number (17993052).

Almost surely, 2^66831323 is an apocalyptic number.

66831323 is a deficient number, since it is larger than the sum of its proper divisors (5140885).

66831323 is a wasteful number, since it uses less digits than its factorization.

66831323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5140884.

The product of its digits is 15552, while the sum is 32.

The square root of 66831323 is about 8175.0426910200. The cubic root of 66831323 is about 405.8136829430.

The spelling of 66831323 in words is "sixty-six million, eight hundred thirty-one thousand, three hundred twenty-three".