Hex #66d7cc or rgb(102,215,204) in RGB space is the tint of cyan. It has hue angle of 174.16 degrees, value = 84 and saturation = 53. #66d7cc can be obtained by mixing 4 colors: 4 drops of cyan, 1 drop of green, 4 drops of white, 1 drop of black.
Nearest safe hex - #66cccc. Below you can see the block with #66d7cc color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66d7cc to the mixer and play with it.