66683399 has 4 divisors (see below), whose sum is σ = 66751680. Its totient is φ = 66615120.

The previous prime is 66683389. The next prime is 66683423. The reversal of 66683399 is 99338666.

66683399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66683399 - 2⁸ = 66683143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66683359) 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 in 3 ways as a sum of consecutive naturals, for example, 32654 + ... + 34635.

It is an arithmetic number, because the mean of its divisors is an integer number (16687920).

Almost surely, 2^66683399 is an apocalyptic number.

66683399 is a deficient number, since it is larger than the sum of its proper divisors (68281).

66683399 is an equidigital number, since it uses as much as digits as its factorization.

66683399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68280.

The product of its digits is 1259712, while the sum is 50.

The square root of 66683399 is about 8165.9903869647. The cubic root of 66683399 is about 405.5140533443.

The spelling of 66683399 in words is "sixty-six million, six hundred eighty-three thousand, three hundred ninety-nine".