66323689 has 2 divisors, whose sum is σ = 66323690. Its totient is φ = 66323688.

The previous prime is 66323687. The next prime is 66323693. The reversal of 66323689 is 98632366.

66323689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59907600 + 6416089 = 7740^2 + 2533^2 .

It is a cyclic number.

It is not a de Polignac number, because 66323689 - 2¹ = 66323687 is a prime.

Together with 66323687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66323687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33161844 + 33161845.

It is an arithmetic number, because the mean of its divisors is an integer number (33161845).

Almost surely, 2^66323689 is an apocalyptic number.

It is an amenable number.

66323689 is a deficient number, since it is larger than the sum of its proper divisors (1).

66323689 is an equidigital number, since it uses as much as digits as its factorization.

66323689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 43.

The square root of 66323689 is about 8143.9357192944. The cubic root of 66323689 is about 404.7835840157.

The spelling of 66323689 in words is "sixty-six million, three hundred twenty-three thousand, six hundred eighty-nine".