Hex #158780 or rgb(21,135,128) in RGB space is the tint of cyan. It has hue angle of 176.32 degrees, value = 53 and saturation = 84. #158780 can be obtained by mixing 4 colors: 5 drops of cyan, 1 drop of green, 1 drop of white, 5 drops of black.
Nearest safe hex - #009999. Below you can see the block with #158780 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #158780 to the mixer and play with it.