Hex #158bab or rgb(21,139,171) in RGB space is the tint of bluish cian. It has hue angle of 192.80 degrees, value = 67 and saturation = 88. #158bab can be obtained by mixing 4 colors: 1 drop of magenta, 5 drops of blue, 4 drops of cyan, 2 drops of green.
Nearest safe hex - #009999. Below you can see the block with #158bab color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #158bab to the mixer and play with it.