Hex #665739 or rgb(102,87,57) in RGB space is the tint of khaki. It has hue angle of 40.00 degrees, value = 40 and saturation = 44. #665739 can be obtained by mixing 4 colors: 4 drops of yellow, 2 drops of red, 5 drops of blue, 4 drops of black.
Nearest safe hex - #666633. Below you can see the block with #665739 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #665739 to the mixer and play with it.