'Mighty Angel' in the Bible

I also saw a mighty angel proclaiming in a loud voice, “Who is worthy to open the scroll and break its seals?”

Then I saw another mighty angel coming down from heaven, surrounded by a cloud, with a rainbow over his head. His face was like the sun, his legs were like fiery pillars,

Then a mighty angel picked up a stone like a large millstone and threw it into the sea, saying:In this way, Babylon the great citywill be thrown down violentlyand never be found again.