Hex #666b56 or rgb(102,107,86) in RGB space is the tint of lime. It has hue angle of 74.29 degrees, value = 42 and saturation = 20. #666b56 can be obtained by mixing 4 colors: 3 drops of yellow, 1 drop of red, 5 drops of blue, 1 drop of black.
Nearest safe hex - #666666. Below you can see the block with #666b56 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #666b56 to the mixer and play with it.