Hex #669d80 or rgb(102,157,128) in RGB space is the tint of teal. It has hue angle of 148.36 degrees, value = 62 and saturation = 35. #669d80 can be obtained by mixing 4 colors: 3 drops of red, 4 drops of cyan, 2 drops of green, 1 drop of white.
Nearest safe hex - #669999. Below you can see the block with #669d80 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #669d80 to the mixer and play with it.