The ecetonduplex is equal to E303#3 = EEE303 = 101010303, using Hyper-E notation. The term was coined by Sbiis Saibian. It is equal to one followed by an ecetonplex zeroes. It is 1010303+1 digits long.
Writing down the full decimal expansion would take 1010303-6 books of 400 pages each, with 2,500 digits on each page.