10664809 has 2 divisors, whose sum is σ = 10664810. Its totient is φ = 10664808.

The previous prime is 10664791. The next prime is 10664821. The reversal of 10664809 is 90846601.

10664809 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., 6744409 + 3920400 = 2597^2 + 1980^2 .

It is an emirp because it is prime and its reverse (90846601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10664809 - 2¹³ = 10656617 is a prime.

It is a super-2 number, since 2×10664809² = 227476302012962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10664869) 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, 5332404 + 5332405.

It is an arithmetic number, because the mean of its divisors is an integer number (5332405).

Almost surely, 2^10664809 is an apocalyptic number.

It is an amenable number.

10664809 is a deficient number, since it is larger than the sum of its proper divisors (1).

10664809 is an equidigital number, since it uses as much as digits as its factorization.

10664809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 10664809 is about 3265.7019153621. The cubic root of 10664809 is about 220.1157036007.

The spelling of 10664809 in words is "ten million, six hundred sixty-four thousand, eight hundred nine".