Hex #66a388 or rgb(102,163,136) in RGB space is the tint of teal. It has hue angle of 153.44 degrees, value = 64 and saturation = 37. #66a388 can be obtained by mixing 4 colors: 2 drops of yellow, 4 drops of cyan, 4 drops of white, 5 drops of black.
Nearest safe hex - #669999. Below you can see the block with #66a388 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66a388 to the mixer and play with it.