If you want to work with big integers, try Math::BigInt, a pure perl module, or Math::BigInt::GMP, an XS module:

         use Math::BigInt;

         # or make it faster: install (optional) Math::BigInt::GMP
         # and always use (it will fall back to pure Perl if the
         # GMP library is not installed):

         use Math::BigInt lib => 'GMP';

         my $str = '1234567890';

         $x = Math::BigInt->new($str);         # defaults to 0
         $y = $x->copy();                      # make a true copy
         $x->badd($y);         # addition (add $y to $x)
         $x->bsub($y);         # subtraction (subtract $y from $x)
         $x->bstr();              # convert to a normalized string
         $x->bsstr();             # normalized string in scientific no
+tation
         $x->as_hex();            # as signed hexadecimal string with 
+prefixed 0x
         $x->as_bin();            # as signed binary string with prefi
+xed 0b

# etc.
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