Hex #1599a3 or rgb(21,153,163) in RGB space is the tint of cyan. It has hue angle of 184.23 degrees, value = 64 and saturation = 87. #1599a3 can be obtained by mixing 4 colors: 1 drop of red, 4 drops of blue, 5 drops of cyan, 2 drops of green.
Nearest safe hex - #009999. Below you can see the block with #1599a3 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #1599a3 to the mixer and play with it.