Hex #66601a or rgb(102,96,26) in RGB space is the tint of yellow. It has hue angle of 55.26 degrees, value = 40 and saturation = 75. #66601a can be obtained by mixing 4 colors: 4 drops of red, 1 drop of cyan, 4 drops of green, 1 drop of black.
Nearest safe hex - #666633. Below you can see the block with #66601a color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66601a to the mixer and play with it.