Hex #66d1d5 or rgb(102,209,213) in RGB space is the tint of cyan. It has hue angle of 182.16 degrees, value = 84 and saturation = 52. #66d1d5 can be obtained by mixing 4 colors: 1 drop of yellow, 2 drops of blue, 4 drops of cyan, 3 drops of white.
Nearest safe hex - #66cccc. Below you can see the block with #66d1d5 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66d1d5 to the mixer and play with it.