Hex #66b89f or rgb(102,184,159) in RGB space is the tint of greenish cian. It has hue angle of 161.71 degrees, value = 72 and saturation = 45. #66b89f can be obtained by mixing 4 colors: 4 drops of yellow, 5 drops of blue, 4 drops of cyan, 2 drops of white.
Nearest safe hex - #66cc99. Below you can see the block with #66b89f color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66b89f to the mixer and play with it.