Hex #669880 or rgb(102,152,128) in RGB space is the tint of teal. It has hue angle of 151.20 degrees, value = 60 and saturation = 33. #669880 can be obtained by mixing 4 colors: 1 drop of red, 3 drops of blue, 3 drops of green, 3 drops of white.
Nearest safe hex - #669999. Below you can see the block with #669880 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #669880 to the mixer and play with it.