Any port number can be used. A port within the 49152-65534 range is suggested as this will avoid internet Service Provider (ISP) blocks and possible conflicts with other programs.
Originally, bittorrent clients used the range of 6881-6999, starting at 6881 and going up if the port was closed. However, ISPs began to block this range and so bittorrent clients were adjusted to use any single port number of the user's choice.
Many ISPs, including mine, still block the 6881-6999 range, so it is best to avoid a port within this range.
The 49152-65534 range is suggested as these numbers are unassigned to any program and therefore there is no risk of conflict with another program.
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Port security is used on a switch and the number of secure MAC addresses for a port is reached, the violation mode that will typically cause an SNMP trap to be sent and traffic to be dropped is the "Shutdown" or "Protect" violation mode.
port 80
If you download a torrent and it's asking for a password, ditch it and download a different copy. Check the comments and feedback on the torrent site you use before download to ensure you get one with no password. The question you ask is unanswerable as there could be any number of copies of that specific file out there with any number of passwords.
Ports are described by 16 bits. 2^16 is 65536 so the highest number is 65535 and port 65536 does not exist.
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