Using Perl's built in conversion of numbers with leading zeros:
$int = 033653337357; # note the leading 0!
$dec = sprintf("%d", $int);Using the oct function:
$int = oct("33653337357");
$dec = sprintf("%d", $int);Using Bit::Vector:
use Bit::Vector;
$vec = Bit::Vector->new(32);
$vec->Chunk_List_Store(3, split(//, reverse "33653337357"));
$dec = $vec->to_Dec();