Hex #66a499 or rgb(102,164,153) in RGB space is the tint of greenish cian. It has hue angle of 169.35 degrees, value = 64 and saturation = 38. #66a499 can be obtained by mixing 4 colors: 1 drop of yellow, 4 drops of cyan, 5 drops of white, 5 drops of black.
Nearest safe hex - #669999. Below you can see the block with #66a499 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66a499 to the mixer and play with it.