Hex #1580b2 or rgb(21,128,178) in RGB space is the tint of bluish cian. It has hue angle of 199.11 degrees, value = 70 and saturation = 88. #1580b2 can be obtained by mixing 4 colors: 1 drop of red, 5 drops of blue, 5 drops of cyan, 1 drop of black.
Nearest safe hex - #009999. Below you can see the block with #1580b2 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #1580b2 to the mixer and play with it.