16 x 4,294,967,295 = 68,719,476,720 (68 GB) 16 x 68,719,476,720 = 1,099,511,627,520 (1 TB) 16 x 1,099,511,627,520 = 17,592,186,040,320 (17 TB) 16 x 17,592,186,040,320 = 281,474,976,645,120 (281 TB) 16 x 281,474,976,645,120 = 4,503,599,626,321,920 (4.5 PB)
There are actually two versions of 42.zip, an older version of 42,374 bytes, and a newer version of 42,838 bytes. The difference is that the newer version requires a password before unzipping. The older version can be found here.
42.zip is a zip bomb, which is a small compressed file that seemingly holds an unimaginably large amount of data inside. I have archived this from https://unforgettable.dk.
More information can be found on my zip bomb homepage.