Hex #664e1a or rgb(102,78,26) in RGB space is the tint of khaki. It has hue angle of 41.05 degrees, value = 40 and saturation = 75. #664e1a can be obtained by mixing 4 colors: 4 drops of red, 1 drop of cyan, 3 drops of green, 2 drops of black.
Nearest safe hex - #666633. Below you can see the block with #664e1a color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #664e1a to the mixer and play with it.