Elvis...look at the place that your responder "lives"...
However, it would seem logical that the paperwork regarding the probate et all would have been (should have been) presented to you.
If your initial paperwork specifically states that you can pay without penalty, then send a certified letter to the current trustees of the note requesting payoff amounts.
If you want to find out what the ballpark figure would be, Google mortgage amortization. Pick one, type in your rate, months and look up months remaining.
The taxes are a little disturbing. It wouldn't be through the IRS, it would be handled through your local Tax Accessors office. IRS handles employment and income. I suggest you contact them and find out exactly why you aren't/haven't been receiving property tax bills. If you were listed originally to receive the bills I can't imagine that changing.
This is important because there are unscrupulous ways to obtain legal rights to property by paying the taxes on them. The time frame, up to 10 + years I think I read, varies from state to state.
I have land tax issues at present regarding a seller so I've been researching the subject.
Hope this helps.
April