Octillion

num

num ·3 syllables ·Rare ·Advanced level

Definitions

Noun
  1. 1
    the number that is represented as a one followed by 27 zeros wordnet
Numeral
  1. 1
    A thousand trillion trillion, a billion billion billion: 1 followed by 27 zeros, 10²⁷. Australia, British, US, modern

    "Altogether it takes seven billion billion billion (that’s 7,000,000,000,000,000,000,000,000,000, or seven octillion) atoms to make you."

  2. 2
    A trillion quintillion: 1 followed by 48 zeros, 10⁴⁸. Australia, British, dated

Synonyms

All synonyms
10271048googoljillionquadrillionzillion

Example

More examples

"Altogether it takes seven billion billion billion (that’s 7,000,000,000,000,000,000,000,000,000, or seven octillion) atoms to make you."

Etymology

From French octillion. By surface analysis, oct- (“eight”) + -illion.

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