Hex #66a199 or rgb(102,161,153) in RGB space is the tint of greenish cian. It has hue angle of 171.86 degrees, value = 63 and saturation = 37. #66a199 can be obtained by mixing 4 colors: 4 drops of yellow, 2 drops of magenta, 4 drops of blue, 5 drops of cyan.
Nearest safe hex - #669999. Below you can see the block with #66a199 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66a199 to the mixer and play with it.