Is my version of Oracle is 64 or 32 bit
There are a number of ways to check whether the version or Oracle you have installed is 64 bit or 32 bit.
Two ways to do so are described here
At the O/S type
file $ORACLE_HOME/bin/oracle
or log in to SQL*Plus and it should display 64 bit mode if 64 bit.
else type from SQL*Plus
select * from v$version;