Evidently Satan was originally one of the most powerful creatures that was ever made by God. Angels in themselves are powerful creatures. Peter tells us that angels are “greater in might and power,” than men, 2Pe 2:11. When Paul speaks of Christ coming on the last day, it will be “when the Lord Jesus is revealed from heaven with his mighty angels in flaming fire,” 2Thes 1:7. Story after story speaks of them having power far beyond that which a man personally can wield.

And Satan’s power?

At first it seems Satan was both good and glorious. Evidently the King of Tyre in Ezekiel 28 is a type, symbolic, of Satan. As is common when there are types or symbols in Scripture, part of Ezekiel 28 applies to the ancient King of Tyre, and part applies to Satan himself. It says that he was in the garden of Eden, Ezek 28:13. However, the King of Tyre was further away from the garden of Eden than we are from the birth of Christ! It says of Satan,

“14 You were the anointed cherub who covers: and I set you, so that you were on the holy mountain of God; you have walked up and down in the midst of the stones of fire. 15 You were perfect in your ways from the day that you were created, until unrighteousness was found in you.”
Ezek 28:14-15

So Satan was originally good and pure, as indeed you and I were before sin seized us. Satan originally one of the covering cherub that surrounded the very throne of God Himself in heaven, as pictured in Ezekiel 1, and Rev 4:6-8. That is to say that Satan was one of the most powerful creatures ever created! It says of him,

“We know that we are of God, and the whole world lies in the power of the evil one.”
1Jn 5:19

Or again it describes Satan,

“in whom the god of this world has blinded the minds of the unbelieving, that the light of the gospel of the glory of Christ, who is the image of God, should not dawn on them.”
2Cor 4:4

So Satan is described as “the god of this world,” or a better translation would be “the god of this age,” which is still quite a description. Further Satan is clearly described here as being able to influence the minds of mere men, and is able to even blind us at times

In Job 1 Satan is able,

to make fire fall from heaven, influence groups of men to steal and kill, cause mighty winds to blow. In Job 2 Satan is able to cause debilitating diseases, and on and on it goes.

If a man has a particular weakness,
Satan is quick to exploit it.

With Judas it was evidently money.

Satan can influence or even enter us!

Jesus says to Peter, “” Get behind me, Satan!” Mtt 16:23

“Satan entered into Judas, who was surnamed Iscariot, who was numbered with the twelve.”
Lk 22:3

Scriptures are from the World English Bible (WEB), a copyright free revision of the original ASV American Standard Version 1901