66982723 has 4 divisors (see below), whose sum is σ = 69143488. Its totient is φ = 64821960.

The previous prime is 66982717. The next prime is 66982753. The reversal of 66982723 is 32728966.

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 66982723 - 2⁹ = 66982211 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 66982723.

It is not an unprimeable number, because it can be changed into a prime (66982753) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1080336 + ... + 1080397.

It is an arithmetic number, because the mean of its divisors is an integer number (17285872).

Almost surely, 2^66982723 is an apocalyptic number.

66982723 is a deficient number, since it is larger than the sum of its proper divisors (2160765).

66982723 is a wasteful number, since it uses less digits than its factorization.

66982723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2160764.

The product of its digits is 217728, while the sum is 43.

The square root of 66982723 is about 8184.2973430833. The cubic root of 66982723 is about 406.1198959157.

The spelling of 66982723 in words is "sixty-six million, nine hundred eighty-two thousand, seven hundred twenty-three".