Hex #66c1cc or rgb(102,193,204) in RGB space is the tint of cyan. It has hue angle of 186.47 degrees, value = 80 and saturation = 50. #66c1cc can be obtained by mixing 3 colors: 1 drop of red, 3 drops of cyan, 1 drop of white.
Nearest safe hex - #66cccc. Below you can see the block with #66c1cc color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66c1cc to the mixer and play with it.