Hex #668c4d or rgb(102,140,77) in RGB space is the tint of olive. It has hue angle of 96.19 degrees, value = 55 and saturation = 45. #668c4d can be obtained by mixing 4 colors: 4 drops of yellow, 3 drops of blue, 1 drop of cyan, 2 drops of black.
Nearest safe hex - #669966. Below you can see the block with #668c4d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #668c4d to the mixer and play with it.