Hex #66a48e or rgb(102,164,142) in RGB space is the tint of greenish cian. It has hue angle of 158.71 degrees, value = 64 and saturation = 38. #66a48e can be obtained by mixing 4 colors: 1 drop of magenta, 4 drops of blue, 5 drops of green, 5 drops of white.
Nearest safe hex - #669999. Below you can see the block with #66a48e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66a48e to the mixer and play with it.