Hex #66bdcc or rgb(102,189,204) in RGB space is the tint of bluish cian. It has hue angle of 188.82 degrees, value = 80 and saturation = 50. #66bdcc can be obtained by mixing 4 colors: 3 drops of blue, 2 drops of cyan, 1 drop of green, 4 drops of white.
Nearest safe hex - #66cccc. Below you can see the block with #66bdcc color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66bdcc to the mixer and play with it.