Hex #66e080 or rgb(102,224,128) in RGB space is the tint of bluish green. It has hue angle of 132.79 degrees, value = 88 and saturation = 54. #66e080 can be obtained by mixing 4 colors: 2 drops of yellow, 3 drops of cyan, 3 drops of green, 2 drops of white.
Nearest safe hex - #66cc99. Below you can see the block with #66e080 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66e080 to the mixer and play with it.