nice talking to you...talking vs to talk
After we had a chat with a person and we'd like to say "we were happy about our chat".
Which of the following are correct?

1 Nice talking to you.
2 Nice to talk to you.
3 Nice talking to you.
4 Nice to have talked to you.

5 It is nice talking to you.
6 It was nice talking to you.

Thanks.

Question

nice talking to you...talking vs to talk
After we had a chat with a person and we'd like to say "we were happy about our chat". 
Which of the following are correct?

1 Nice talking to you.
2 Nice to talk to you.
3 Nice talking to you.
4 Nice to have talked to you.

5 It is nice talking to you.
6 It was nice talking to you.

Thanks.

Answer

All are OK. 1and 3 seem to be exact the same words. 5 means something different.

All but 5 mean " on this occasion I enjoyed our conversation."
5 means on all occasions I enjoy our conversations.

1 and 6 would be the most common. 4 is a little awkward.

If you wanted to emphasize the cooperation in the conversation, you could use "with" instead of "to".

Answer

You would say, "It was nice talking to you," or "It was nice talking with you."