S5 0014+81 is a distant, compact, hyperluminous, broad-absorption-line quasar, or blazar, located near the high declination region of the constellation Cepheus, near the North Equatorial Pole.

In the case of S5 0014+81, it is one of the most luminous quasars known, with a total luminosity of over 1041 watts,[2] equal to an absolute bolometric magnitude of −31.5.

The central black hole of the quasar devours an extremely huge amount of matter, equivalent to 4,000 solar masses of material every year.

They found it to be about 10,000 times more massive than the black hole at the center of our galaxy, or equivalent to 40 billion solar masses.

Evolution models based on the mass of S5 0014+81's supermassive black hole predict that it will live for roughly 1.3×1099 years (near the end of the Black Hole Era of the universe, when it is more than 1088 times its current age), before it dissipates via Hawking radiation.