Hex #665b33 or rgb(102,91,51) in RGB space is the tint of khaki. It has hue angle of 47.06 degrees, value = 40 and saturation = 50. #665b33 can be obtained by mixing 4 colors: 1 drop of red, 3 drops of magenta, 5 drops of green, 1 drop of black.
Nearest safe hex - #666633. Below you can see the block with #665b33 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #665b33 to the mixer and play with it.