How to check oracle database is either 32 bit or 64 bit

There are a lot of method for this, here is one:

[oracle@oel6 ~]$ sqlplus / as sysdba

SQL*Plus: Release Production on Fri Feb 8 12:31:24 2013

Copyright (c) 1982, 2011, Oracle.  All rights reserved.

Connected to:
Oracle Database 11g Enterprise Edition Release - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options

SQL> select length(addr)*4 || '-bits' Bits from v$process where rownum=1;


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