Trying to reconcile the amount sent versus amount transacted
Say I owe you $8, but all I have is a $10 bill. I'll make a transaction that spends my $10 bill and delivers $8 to you and returns $2 to me. The extra 0.02364322 LTC is Coinbase's change, just as the extra $2 is my change.

Coinbase didn't happen to have precisely 0.55177632 LTC in an unspent transaction output, they had 0.5734121 LTC. So they returned some change to themselves.