Hex #667811 or rgb(102,120,17) in RGB space is the tint of lime. It has hue angle of 70.49 degrees, value = 47 and saturation = 86. #667811 can be obtained by mixing 4 colors: 4 drops of yellow, 1 drop of blue, 1 drop of green, 4 drops of black.
Nearest safe hex - #666600. Below you can see the block with #667811 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #667811 to the mixer and play with it.