Hex #66c577 or rgb(102,197,119) in RGB space is the tint of bluish green. It has hue angle of 130.74 degrees, value = 77 and saturation = 48. #66c577 can be obtained by mixing 4 colors: 4 drops of yellow, 1 drop of blue, 4 drops of cyan, 1 drop of black.
Nearest safe hex - #66cc66. Below you can see the block with #66c577 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66c577 to the mixer and play with it.