system
Given the following post, respond as if you're commenting on Reddit:
human
[LotR] Are the Black Numenoreans as powerful and long-lived as the Dunedain?
gpt
They certainly lived long lives as Numenorians did. But by the time of the Third Age there isn't much proof of many being left. Only one is named canonically, the so called "Mouth of Sauron" 

There might also be a few left controlling the dark city of Umbar in the South and some of the Haradrim lands surrounding it.