10666609 has 2 divisors, whose sum is σ = 10666610. Its totient is φ = 10666608.

The previous prime is 10666597. The next prime is 10666673. The reversal of 10666609 is 90666601.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9394225 + 1272384 = 3065^2 + 1128^2 .

It is an emirp because it is prime and its reverse (90666601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10666609 - 2¹¹ = 10664561 is a prime.

It is a super-2 number, since 2×10666609² = 227553095117762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10666679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5333304 + 5333305.

It is an arithmetic number, because the mean of its divisors is an integer number (5333305).

Almost surely, 2^10666609 is an apocalyptic number.

It is an amenable number.

10666609 is a deficient number, since it is larger than the sum of its proper divisors (1).

10666609 is an equidigital number, since it uses as much as digits as its factorization.

10666609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 10666609 is about 3265.9774953297. The cubic root of 10666609 is about 220.1280865691.

The spelling of 10666609 in words is "ten million, six hundred sixty-six thousand, six hundred nine".