6606816809 has 2 divisors, whose sum is σ = 6606816810. Its totient is φ = 6606816808.

The previous prime is 6606816803. The next prime is 6606816841. The reversal of 6606816809 is 9086186066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6135275584 + 471541225 = 78328^2 + 21715^2 .

It is a cyclic number.

It is not a de Polignac number, because 6606816809 - 2²⁰ = 6605768233 is a prime.

It is not a weakly prime, because it can be changed into another prime (6606816803) 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, 3303408404 + 3303408405.

It is an arithmetic number, because the mean of its divisors is an integer number (3303408405).

Almost surely, 2^6606816809 is an apocalyptic number.

It is an amenable number.

6606816809 is a deficient number, since it is larger than the sum of its proper divisors (1).

6606816809 is an equidigital number, since it uses as much as digits as its factorization.

6606816809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 6606816809 is about 81282.3277779371. The cubic root of 6606816809 is about 1876.4230319768.

The spelling of 6606816809 in words is "six billion, six hundred six million, eight hundred sixteen thousand, eight hundred nine".