This thread is going to be powerscaling the solo God himself:

At the age of 7, itachi was stated as kage level.

Hashirama was a kage, therefore,

It was stated only someone with a sharingan kekai genkai can beat him

He scales to kakashi, who was stated omnipotent, making itachi omnipotent+

Obito was scared of itachi, therefore itachi scales to juubito who hashirama admits is stronger than him

This is consistent, as itachi was casually throwing hand with naruto who fought kaguya

Based on all the evidence, it’s clear itachi solos the verse, he scales above omnipotence, and can only be beaten by someone with a sharingan.

And his susanoo is invincible, as stated by zetsu - kaguyas will.

This is my first time power scaling, let me know how I went

One last thing