Hex #66de77 or rgb(102,222,119) in RGB space is the tint of bluish green. It has hue angle of 128.50 degrees, value = 87 and saturation = 54. #66de77 can be obtained by mixing 4 colors: 3 drops of yellow, 4 drops of cyan, 5 drops of green, 3 drops of white.
Nearest safe hex - #66cc66. Below you can see the block with #66de77 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66de77 to the mixer and play with it.