Hex #66621a or rgb(102,98,26) in RGB space is the tint of yellow. It has hue angle of 56.84 degrees, value = 40 and saturation = 75. #66621a can be obtained by mixing 4 colors: 3 drops of red, 4 drops of green, 1 drop of white, 2 drops of black.
Nearest safe hex - #666633. Below you can see the block with #66621a color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66621a to the mixer and play with it.