2666309 has 2 divisors, whose sum is σ = 2666310. Its totient is φ = 2666308.

The previous prime is 2666303. The next prime is 2666381. The reversal of 2666309 is 9036662.

2666309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2656900 + 9409 = 1630^2 + 97^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2666309 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2666303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333154 + 1333155.

It is an arithmetic number, because the mean of its divisors is an integer number (1333155).

2^2666309 is an apocalyptic number.

It is an amenable number.

2666309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666309 is an equidigital number, since it uses as much as digits as its factorization.

2666309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 2666309 is about 1632.8836455792. The cubic root of 2666309 is about 138.6660547875. Note that the first 3 decimals are identical.

The spelling of 2666309 in words is "two million, six hundred sixty-six thousand, three hundred nine".