Hex #66a4aa or rgb(102,164,170) in RGB space is the tint of cyan. It has hue angle of 185.29 degrees, value = 67 and saturation = 40. #66a4aa can be obtained by mixing 4 colors: 1 drop of red, 5 drops of cyan, 5 drops of white, 4 drops of black.
Nearest safe hex - #669999. Below you can see the block with #66a4aa color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66a4aa to the mixer and play with it.