Hex #157ab2 or rgb(21,122,178) in RGB space is the tint of bluish cian. It has hue angle of 201.40 degrees, value = 70 and saturation = 88. #157ab2 can be obtained by mixing 4 colors: 1 drop of magenta, 4 drops of blue, 5 drops of cyan, 2 drops of black.
Nearest safe hex - #006699. Below you can see the block with #157ab2 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #157ab2 to the mixer and play with it.