Hex #66b288 or rgb(102,178,136) in RGB space is the tint of teal. It has hue angle of 146.84 degrees, value = 70 and saturation = 43. #66b288 can be obtained by mixing 4 colors: 3 drops of red, 5 drops of cyan, 4 drops of green, 3 drops of white.
Nearest safe hex - #669999. Below you can see the block with #66b288 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66b288 to the mixer and play with it.