Hex #66dbcc or rgb(102,219,204) in RGB space is the tint of greenish cian. It has hue angle of 172.31 degrees, value = 86 and saturation = 53. #66dbcc can be obtained by mixing 4 colors: 1 drop of yellow, 5 drops of cyan, 3 drops of white, 1 drop of black.
Nearest safe hex - #66cccc. Below you can see the block with #66dbcc color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66dbcc to the mixer and play with it.