Hex #66c7d8 or rgb(102,199,216) in RGB space is the tint of bluish cian. It has hue angle of 188.95 degrees, value = 85 and saturation = 53. #66c7d8 can be obtained by mixing 4 colors: 1 drop of yellow, 4 drops of blue, 5 drops of cyan, 5 drops of white.
Nearest safe hex - #66cccc. Below you can see the block with #66c7d8 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66c7d8 to the mixer and play with it.