Hex #66a7aa or rgb(102,167,170) in RGB space is the tint of cyan. It has hue angle of 182.65 degrees, value = 67 and saturation = 40. #66a7aa can be obtained by mixing 3 colors: 2 drops of blue, 1 drop of green, 2 drops of white.
Nearest safe hex - #669999. Below you can see the block with #66a7aa color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66a7aa to the mixer and play with it.