Hex #66aa6c or rgb(102,170,108) in RGB space is the tint of green. It has hue angle of 125.29 degrees, value = 67 and saturation = 40. #66aa6c can be obtained by mixing 4 colors: 3 drops of yellow, 5 drops of blue, 4 drops of green, 3 drops of white.
Nearest safe hex - #669966. Below you can see the block with #66aa6c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66aa6c to the mixer and play with it.