Endekacthulhum is a googolism coined by Douglas Shamlin Jr. equal to E100#{11}#100, or E100#^^^^^^^^^^^#100.
Douglas Shamlin Jr. uploaded the name in a large number list video deleted then reuploaded by someone on youtube.
The number has an official name given by Sbiis Saibian, the dekacthularxihect.
The endekacthulhum regiment by me: here