He can split into multiple mini versions of himself, get super muscular, fire brimstones, fly above rooms and stomp down with his hooves.
[spoiler]If you recognized this as a binding of isaac reference goos on ya[/spoiler]
He can talk to Dolphins, and ask them to do things. And normally they listen, because they're worthwhile things, like torture or killing or rap[i]e[/i] behavior.
He came before the Abrahamic religions' man-created "God," AKA the deceiver. To some he is omnipotent, and to some he is a symbol for freedom. [spoiler]huehuehue[/spoiler]
In Islam he is a jinn so he is physically a lot stronger than humans but weaker than the angels. He is afraid of arch angels.
His power comes from his deception. He makes sin beautiful for the people and pretends to be innocent after you commit the sin. Saying "I fear God, you did that yourself" type of thing.
Quran 59:16 - [The hypocrites are] like the example of Satan when he says to man, "Disbelieve." But when he disbelieves, he says, "Indeed, I am disassociated from you. Indeed, I fear Allah , Lord of the worlds."