as stated above there is a 50/50 split, with the tie-breaking vote going to the VP, however, there is currently one Democratic Senator in the hospital so depending on when this is voted on there will not be a democratic majority, even if there was there would have to be 0 out of 50 republicans (52 if you want to include Manchina nd Sinemea) who would not Filibuster the bill which would require 60 votes to save it. In all likelihood, unless nobody cares about this bill and it just gets passed "under the table" its not making it past the Senate.If I'm not mistaken and I very possible could be the 60 votes is required to pass a bill without debate, if they don't get 60 votes then it has to be debated. After the debate it is passed with a simple majority vote.
Filibuster is just one side talking for so long that they run out of time and don't get a chance to do the final vote.