11668661 has 2 divisors, whose sum is σ = 11668662. Its totient is φ = 11668660.

The previous prime is 11668619. The next prime is 11668667. The reversal of 11668661 is 16686611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10824100 + 844561 = 3290^2 + 919^2 .

It is a cyclic number.

It is not a de Polignac number, because 11668661 - 2⁶ = 11668597 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 (11668667) 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, 5834330 + 5834331.

It is an arithmetic number, because the mean of its divisors is an integer number (5834331).

Almost surely, 2^11668661 is an apocalyptic number.

It is an amenable number.

11668661 is a deficient number, since it is larger than the sum of its proper divisors (1).

11668661 is an equidigital number, since it uses as much as digits as its factorization.

11668661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 35.

The square root of 11668661 is about 3415.9421833515. The cubic root of 11668661 is about 226.8159932504.

The spelling of 11668661 in words is "eleven million, six hundred sixty-eight thousand, six hundred sixty-one".