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Not to be confused with googgol.

Googgool is equal to $$g(2,50,g(2,50,3)) = (3^{50})^{50} = 3^{2,500} \approx 6.36 \cdot 10^{1,192}$$.[1] It is part of the googo- naming system.

Decimal expansion

63553108734248046535982705738863784081256874738250414054277032649181341629924805223825579632582250153152860142236847440517159685561108270137382236348347380270870131022028173889453116041859099332124863339466206501722683297355317134378131675205996603059662688529463134553700317096778128553775238330973006312020543245000873900294572611137285300370310146601734921915127040204395134642680962098706436931413145287689013204685102981704663947300848707457056966458200388034749090827474538896728031534581007691424596241021730992156251490697661439476891360193995131514821875585068098976068569430987716080762991957223637440222367081507848375468726545047139690760087502210081246310223670558399845114369751675996716640576534410142985434919435257161068234698925785952400047690776837578680602441552132834474084290851263409007780171523558912310980066113160681782369522724840694846457074930662870163436122173306261762808209966000697867491873949059421366809837898447053380106844110365898205985696728437439290568750315804545813056270201280650427470385509146502719757868229090024815960897584518727004620578783701802944854189289979171201831059304500176657242648878241756809221694960948643339814159646402097888050001

Sources

1. [1] (old version, as the new version has redefined the value)