Sorry. Like mine, your Perl uses 32-bit integers (8 bits/byte * 4 byte = 32 bits). It can't hold a 64-bit number (64 bits / 8 bits/byte = 8 bytes) unless you use something like Math::BigInt. You won't be able to use unpack 'Q'.

Tell me which cell of my table you want, and I'll provide some code to do the same thing.