Hex #66a677 or rgb(102,166,119) in RGB space is the tint of bluish green. It has hue angle of 135.94 degrees, value = 65 and saturation = 39. #66a677 can be obtained by mixing 4 colors: 3 drops of yellow, 1 drop of magenta, 4 drops of cyan, 2 drops of black.
Nearest safe hex - #669966. Below you can see the block with #66a677 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66a677 to the mixer and play with it.