Hex #66d080 or rgb(102,208,128) in RGB space is the tint of bluish green. It has hue angle of 134.72 degrees, value = 82 and saturation = 51. #66d080 can be obtained by mixing 4 colors: 3 drops of yellow, 1 drop of red, 5 drops of cyan, 1 drop of green.
Nearest safe hex - #66cc99. Below you can see the block with #66d080 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66d080 to the mixer and play with it.