Septillion

//sɛpˈtɪljən// num

num ·Rare ·Advanced level

Definitions

Noun
  1. 1
    the number that is represented as a one followed by 24 zeros in the US wordnet
Numeral
  1. 1
    A trillion trillion: 1 followed by 24 zeros, 10²⁴. US
  2. 2
    A billion quintillion: 1 followed by 42 zeros, 10⁴².

Synonyms

All synonyms
10241042googolheptillionjillionquadrillion

Etymology

From French septillion, from sept- (“seven”) + -illion. By surface analysis, sept- + -illion.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.