Hex #15618e or rgb(21,97,142) in RGB space is the tint of bluish cian. It has hue angle of 202.31 degrees, value = 56 and saturation = 85. #15618e can be obtained by mixing 4 colors: 1 drop of magenta, 3 drops of blue, 4 drops of cyan, 4 drops of black.
Nearest safe hex - #006699. Below you can see the block with #15618e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #15618e to the mixer and play with it.