Hex #555700 or rgb(85,87,0) in RGB space is the tint of yellow. It has hue angle of 61.38 degrees, value = 34 and saturation = 100. #555700 can be obtained by mixing 4 colors: 1 drop of yellow, 2 drops of red, 3 drops of green, 3 drops of black.
Nearest safe hex - #666600. Below you can see the block with #555700 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #555700 to the mixer and play with it.