Hex #554f2b or rgb(85,79,43) in RGB space is the tint of khaki. It has hue angle of 51.43 degrees, value = 33 and saturation = 49. #554f2b can be obtained by mixing 4 colors: 1 drop of yellow, 1 drop of red, 1 drop of cyan, 3 drops of black.
Nearest safe hex - #666633. Below you can see the block with #554f2b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #554f2b to the mixer and play with it.