Ranked by relevance and common usage.
Keep "octodecillion" when the sentence already sounds natural, when a synonym would add unintended emphasis, or when readers need the most familiar wording. A synonym should clarify or sharpen the message, not simply make the sentence look more varied.
If two options seem close, choose the one that best matches the audience and purpose of the sentence.
Choose a synonym only if it keeps the core idea of "octodecillion" intact in the sentence you are editing.
Check whether the replacement sounds more formal, casual, emotional, technical, or forceful than the original word.
Read the full sentence after the swap. Keep the synonym only when the sentence becomes clearer or more precise.
Review note: Synonym lists are ranked with lexical data and reviewed for practical writing value. Use the comparison notes, sentence evidence, and source labels together; a high-ranking synonym can still be wrong when the audience, register, or grammar changes.
After choosing a replacement for "octodecillion", read the sentence once for meaning and once for rhythm. The best synonym should feel natural in the full sentence, not only accurate in a word list.
If the synonym makes the sentence slower, vaguer, or more dramatic than intended, keep "octodecillion" or choose a simpler alternative from the closest-match group.
4 total sentences available.
1962, David Bergamini, The Universe, Time-Life Books, Google Books considers page number to be top-secret The reason is that the rays created in the core are softened on their outward journey by being handled by the octodecillion-odd atoms of gas outside the core that are part of the sun but play no part in the central fusions.
Source: wiktionary
How many Stars Shine on Tiny Jennifer’s Hair? ... Two million, three hundred and forty nine thousand, eight hundred seventy five vigintillion, seven hundred fifty four novemdecillion, five hundred forty three octodecillion, four hundred fifty seven septendecillion...
Source: wiktionary
2004, Jay Carty, Darrell Waltrip (co-author), Darrell Waltrip One-On-One, The Faith That Took Him to the Finish Line, Gospel Light Publishing, →ISBN, “Day 23”, unpaged the odds on the development of a polypeptide, which is a protein building block, is 6 times 10 to the 57th power, or 600 octodecillion, to 1.
Source: wiktionary
No need to sit and worry about it, though. Although it could occur tomorrow, the odds are that the universe has a lifetime of somewhere between 10 octodecillion years (one with 58 zeros after it) and 10 quinquadragintillion years (one with 139 zeros after it).
Source: wiktionary
Closest matches include googol, jillion, quadrillion, zillion.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.