You can switch it to any port you want. Problem is that it's super easy to spot on security monitoring tools. I deal with "SSH not on port 22" alerts at least once a month.
It's possible to get around this by tunneling SSH over other protocols: http://dag.wiee.rs/howto/ssh-http-tunneling/. Bear in mind if you do this in a corporate environment, security will throw the largest book they can find at you.
