Praying for Satan?

I was asked why not pray for Satan’s salvation in our Lord and Savior Jesus Christ?
The person thought if we prayed for Satan to humble himself and come into the understanding, ever forgiving love and grace of God, through our Lord and Savior Jesus Christ, the God, who forgives and loves all of us, would not this prayer be helpful for all of us who battle everyday, “For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places, EPH 6:12.”

MY ANSWER re pray for Satan:
I understand your thought: if Satan was converted life for all of us would be better.

Several suggestions I have:
1. The conversion or removal of evil in our life is sometimes God's plan and sometimes He wants us to become strong by standing up to our enemy.
2. I suggest not focusing on Satan (leave that to Jesus and His heavenly forces), rather, focus on your immediate life here on planet earth.
3. Notice the "binding" of Satan for a 1,000 years in the end of the book of revelation - since it is in God's Word you could pray for that, and be hopeful about that. Even more hopeful is -
4. Satan may already be bound and we just don't know it.
5. No-one knows what "Satan being bound for a thousand years" would look like. We think life should be easy and peace would rule, etc. Not!
6. Satan is not our biggest enemy - if the number of Biblical admonitions is our evidence - sin and sin patterns in our life (our 'sinful nature') are the number one enemy. Sin and sinful nature are still around. These will need defeating in our own life.
6. At times we may be harassed by a human whose life is evil in the extent of the damage he does. God sometimes removes such an 'enemy agent' because of the damage being done. There may be times to bite the bullet and asked for the conversion or removal of an 'enemy agent.' This is someone in your work place, church or family, who is causing great destruction, leading many astray, deceiving many, seriously abusing many. An example might be a clergyman who seduces many women or makes moves on young boys. It could be an administrator who creates financial havoc or undermines the moral of an organization.
7. A creative prayer for 'deliverance' might be appropriate in this situation. Check with someone to make sure this is not just your own personal hurt and animosity. Is it clear to more than one that this one is doing evil? Many will come to the defense of a minister prefer to 'think no evil' and will ignore a well covered up trail of abuse and defilement of the position and authority of the holy man.
8. If yes then 'give God permission,' if it is God's will, to "convert of remove" this agent of darkness.
9. To summarize I would not focus your prayers on Satan either to bind him or convert him. Leave dealing with satan to God. As for you, love God, do good and by that you will be undermining the work of the devil.