Hex #555744 or rgb(85,87,68) in RGB space is the tint of yellow. It has hue angle of 66.32 degrees, value = 34 and saturation = 22. #555744 can be obtained by mixing 4 colors: 5 drops of red, 4 drops of cyan, 2 drops of green, 4 drops of black.
Nearest safe hex - #666633. Below you can see the block with #555744 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #555744 to the mixer and play with it.