9866669 has 2 divisors, whose sum is σ = 9866670. Its totient is φ = 9866668.

The previous prime is 9866653. The next prime is 9866671. The reversal of 9866669 is 9666689.

9866669 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., 8008900 + 1857769 = 2830^2 + 1363^2 .

It is an emirp because it is prime and its reverse (9666689) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9866669 - 2⁴ = 9866653 is a prime.

It is a super-2 number, since 2×9866669² = 194702314311122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 9866671, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9863669) 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, 4933334 + 4933335.

It is an arithmetic number, because the mean of its divisors is an integer number (4933335).

Almost surely, 2^9866669 is an apocalyptic number.

It is an amenable number.

9866669 is a deficient number, since it is larger than the sum of its proper divisors (1).

9866669 is an equidigital number, since it uses as much as digits as its factorization.

9866669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 50.

The square root of 9866669 is about 3141.1254352541. The cubic root of 9866669 is about 214.4816719017.

The spelling of 9866669 in words is "nine million, eight hundred sixty-six thousand, six hundred sixty-nine".