Hex #666f17 or rgb(102,111,23) in RGB space is the tint of yellow. It has hue angle of 66.14 degrees, value = 44 and saturation = 79. #666f17 can be obtained by mixing 4 colors: 4 drops of yellow, 2 drops of magenta, 4 drops of green, 5 drops of black.
Nearest safe hex - #666600. Below you can see the block with #666f17 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #666f17 to the mixer and play with it.