By byte size and number of inputs/outputs, what are the largest transactions in the block chain so far? Disregarding value, but instead going by size in the protocol, what are the largest transactions so far in the history of Bitcoin, in terms of:


byte size
number of inputs ("vin")
number of outputs ("vout")
total number of inputs and outputs
The largest single transaction to date is 465,554 bytes.  It's hash is 659135664894e50040830edb516a76f704fd2be409ecd8d1ea9916c002ab28a2.
The same transaction has the largest number of inputs: 2,585.
Two transactions tie for the largest number of outputs: 623463a2a8a949e0590ffe6b2fd3e4e1028b2b99c747e82e899da4485eb0b6be and 5143cf232576ae53e8991ca389334563f14ea7a7c507a3e081fbef2538c84f6e both have 3,075 outputs
The same two transactions have the largest number of inputs plus outputs, although they only have a single input so the total is 3,076 inputs plus outputs.


Note, however, that the blockchain has been used to store information by manipulating output addresses so it is more than likely that the transactions listed in 3) are not "real", in that they do not contain spendable outputs.