Hex #554f40 or rgb(85,79,64) in RGB space is the tint of khaki. It has hue angle of 42.86 degrees, value = 33 and saturation = 25. #554f40 can be obtained by mixing 4 colors: 1 drop of yellow, 3 drops of red, 3 drops of cyan, 5 drops of black.
Nearest safe hex - #666633. Below you can see the block with #554f40 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #554f40 to the mixer and play with it.