Hex #66603f or rgb(102,96,63) in RGB space is the tint of khaki. It has hue angle of 50.77 degrees, value = 40 and saturation = 38. #66603f can be obtained by mixing 4 colors: 5 drops of red, 4 drops of blue, 5 drops of green, 1 drop of white.
Nearest safe hex - #666633. Below you can see the block with #66603f color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66603f to the mixer and play with it.