6669709 has 2 divisors, whose sum is σ = 6669710. Its totient is φ = 6669708.

The previous prime is 6669697. The next prime is 6669769. The reversal of 6669709 is 9079666.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3694084 + 2975625 = 1922^2 + 1725^2 .

It is a cyclic number.

It is not a de Polignac number, because 6669709 - 2⁹ = 6669197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6669769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334854 + 3334855.

It is an arithmetic number, because the mean of its divisors is an integer number (3334855).

Almost surely, 2^6669709 is an apocalyptic number.

It is an amenable number.

6669709 is a deficient number, since it is larger than the sum of its proper divisors (1).

6669709 is an equidigital number, since it uses as much as digits as its factorization.

6669709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 6669709 is about 2582.5779755895. The cubic root of 6669709 is about 188.2358308751.

Subtracting from 6669709 its sum of digits (43), we obtain a palindrome (6669666).

The spelling of 6669709 in words is "six million, six hundred sixty-nine thousand, seven hundred nine".