64 bit Binary

Hey Guys,

I've been referencing these forums for some time, but have always generally found what I needed here, or somewhere else if necessary, unfortunately though I've become stuck with this particular problem and can't find any way of doing what I need!

I receive a .csv with multiple columns of data. Column I contains a 64bit binary value stored in decimal format, the largest of which can be produced is:

9223372036854770000

Now, I've already discovered that excel's built in dec2bin() function is not powerful enough to convert a number this large, and whilst there are some user techniques out there to break down larger numbers, but it seems mine is too big for that too.

What I need to do is find a way to

1) Convert it back into Binary, (for the above one, for examples sake)
111111111111111111111111111111111111111111111111110100000000000

2) Split this output into separate columns, e.g. column I has the original decimal value, columns M onward would then be filled with 1,1,1,1,1 etc

I have no coding skill whatsoever, but I do understand how VB functions so I imagine this is possible via a custom function maybe, please help!