Hex #66a380 or rgb(102,163,128) in RGB space is the tint of teal. It has hue angle of 145.57 degrees, value = 64 and saturation = 37. #66a380 can be obtained by mixing 4 colors: 1 drop of magenta, 2 drops of blue, 4 drops of green, 3 drops of white.
Nearest safe hex - #669999. Below you can see the block with #66a380 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66a380 to the mixer and play with it.