FC3 strange lastlog size

["T. Horsnell" <tsh@xxxxxxxxxxxxxxxxx>]

Hi all,
Can someone explain this please:

[root@ls1 log]$ ls -l /var/log/lastlog
-r--------  1 root root 1254130450140 May 13 16:41 /var/log/lastlog
[root@ls1 log]$ du -sk /var/log/lastlog
48      /var/log/lastlog

I presume the 'ls' command output is wrong (1.2TBytes) but how do
I get the real length in bytes?

Cheers,
Terry.