it s 10 exponantial 77 and not 1077...
Wrong infomration from this web page : https://www.coinmama.com/blog/40-surprising-facts-about-bitcoin/
This webpage provides the right information
https://bitzuma.com/posts/six-things-bitcoin-users-should-know-about-private-keys/
Thanks againn to correct it and Mea Culpa
reply
0xFFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFE BAAE DCE6 AF48 A03B BFD2 5E8C D036 4141
or around1.1579208924×10^77