6606661409 has 2 divisors, whose sum is σ = 6606661410. Its totient is φ = 6606661408.

The previous prime is 6606661331. The next prime is 6606661421. The reversal of 6606661409 is 9041666066.

6606661409 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5882890000 + 723771409 = 76700^2 + 26903^2 .

It is a cyclic number.

It is not a de Polignac number, because 6606661409 - 2⁸ = 6606661153 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6606661409.

It is not a weakly prime, because it can be changed into another prime (6606661909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3303330704 + 3303330705.

It is an arithmetic number, because the mean of its divisors is an integer number (3303330705).

Almost surely, 2^6606661409 is an apocalyptic number.

It is an amenable number.

6606661409 is a deficient number, since it is larger than the sum of its proper divisors (1).

6606661409 is an equidigital number, since it uses as much as digits as its factorization.

6606661409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 6606661409 is about 81281.3718449683. The cubic root of 6606661409 is about 1876.4083199789.

The spelling of 6606661409 in words is "six billion, six hundred six million, six hundred sixty-one thousand, four hundred nine".