Hex #667f66 or rgb(102,127,102) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 50 and saturation = 20. #667f66 can be obtained by mixing 4 colors: 2 drops of red, 3 drops of blue, 3 drops of green, 2 drops of white.
Nearest safe hex - #666666. Below you can see the block with #667f66 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #667f66 to the mixer and play with it.