Hidden user

My site has been hacked. I’ve noticed that the “counter” for the number of Super Admins shows 4. I only have 3. I looked in wp_sitemeta site_admins and found this:

a:4:{i:0;s:5:"admin";i:2;s:18:"unverified_fRTdIPX";i:3;s:10:"d********h";i:4;s:24:"c***k@c************n.com";}

I have no idea who/what unverified_fRTdIPX is.

I am not a coder. What looks to me like the changes I should make are these:
delete i:2;s:18:”unverified_fRTdIPX”;
change a:4: to a:3:
change i:3;s:10:”d********h”; to i:2;s:10:”d********h”;
change i:4;s:24:”c***k@c************n.com”; to i:3;s:24:”c***k@c************n.com”;

Is that correct? Is there something else I should be changing? Thank you for the help.