Hex #66c3cc or rgb(102,195,204) in RGB space is the tint of cyan. It has hue angle of 185.29 degrees, value = 80 and saturation = 50. #66c3cc can be obtained by mixing 4 colors: 1 drop of red, 5 drops of cyan, 3 drops of white, 1 drop of black.
Nearest safe hex - #66cccc. Below you can see the block with #66c3cc color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66c3cc to the mixer and play with it.