Hex #66aab3 or rgb(102,170,179) in RGB space is the tint of cyan. It has hue angle of 187.01 degrees, value = 70 and saturation = 43. #66aab3 can be obtained by mixing 4 colors: 2 drops of red, 5 drops of cyan, 2 drops of white, 1 drop of black.
Nearest safe hex - #6699cc. Below you can see the block with #66aab3 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66aab3 to the mixer and play with it.