How to create MongoDB Long DataType from String in node.js

Reading the page about the MongoDB Long Datatype - it says I create one like this:

var myLong = new Long(low, high);

Where low and high are signed 32 bit parts of the larger 64 bit number...

I have got the following number as a string using node-bigint

'164150943396226415094339622641509433'

How do I convert this 64-bit!?! string into the 32-bit low and high bits needed for the Long constructor...

Also - would an indexed Mongo $gt search be quicker with a string or the Long?

Thanks in advance - I'm out of my depth...

EDIT 1

Right - on the original (much fuzzier) thread - the answer is that this number is too big for 64 bit....

So - my question is, what is the fastest way to save and search this number in 2 parts, so the original string becomes:

'164150943396226415' and '094339622641509433'

Should I turn them into Longs (in which case what about the leading zero) or is string searching as fast / slower...

You could re-phrase the question:

In MongoDB would a Long or String be faster for:

'164150943396226415'

Thanks again....