Hex #668e4d or rgb(102,142,77) in RGB space is the tint of olive. It has hue angle of 96.92 degrees, value = 56 and saturation = 46. #668e4d can be obtained by mixing 4 colors: 3 drops of yellow, 1 drop of red, 3 drops of cyan, 3 drops of black.
Nearest safe hex - #669966. Below you can see the block with #668e4d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #668e4d to the mixer and play with it.