Hex #554f39 or rgb(85,79,57) in RGB space is the tint of khaki. It has hue angle of 47.14 degrees, value = 33 and saturation = 33. #554f39 can be obtained by mixing 4 colors: 1 drop of yellow, 2 drops of red, 2 drops of cyan, 4 drops of black.
Nearest safe hex - #666633. Below you can see the block with #554f39 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #554f39 to the mixer and play with it.