66004709 has 2 divisors, whose sum is σ = 66004710. Its totient is φ = 66004708.

The previous prime is 66004669. The next prime is 66004721. The reversal of 66004709 is 90740066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63648484 + 2356225 = 7978^2 + 1535^2 .

It is a cyclic number.

It is not a de Polignac number, because 66004709 - 2⁸ = 66004453 is a prime.

It is a super-2 number, since 2×66004709² = 8713243220349362, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66004739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33002354 + 33002355.

It is an arithmetic number, because the mean of its divisors is an integer number (33002355).

Almost surely, 2^66004709 is an apocalyptic number.

It is an amenable number.

66004709 is a deficient number, since it is larger than the sum of its proper divisors (1).

66004709 is an equidigital number, since it uses as much as digits as its factorization.

66004709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 66004709 is about 8124.3282183821. The cubic root of 66004709 is about 404.1336130454.

The spelling of 66004709 in words is "sixty-six million, four thousand, seven hundred nine".