Hex #669b72 or rgb(102,155,114) in RGB space is the tint of bluish green. It has hue angle of 133.58 degrees, value = 61 and saturation = 34. #669b72 can be obtained by mixing 4 colors: 2 drops of yellow, 4 drops of magenta, 4 drops of cyan, 5 drops of green.
Nearest safe hex - #669966. Below you can see the block with #669b72 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #669b72 to the mixer and play with it.