octillion
Twenty-seven zeros follow
Octillion is the number represented by 1 followed by 27 zeros (10²⁷) in American usage, or 1 followed by 48 zeros (10⁴⁸) in British usage.
Like other large number words—trillion, quadrillion, quintillion—it appears mainly in scientific contexts or for rhetorical effect: There are octillions of atoms in the human body.
Ten to the eighteenth
- sextillionTen to twenty-first power
- septillionTen to the twenty-fourth
- nonillionTen to the thirtieth
- decillionNumber with 33 zeros
googol · googolplex · quadrillion · trillion · billion · million · exponent · power
Smallest elemental units
- moleculesBonded atomic groups
- particlesMinute pieces of matter
- starsLuminous celestial bodies
- cellsBasic biological units
bacteria · neurons · calculations · operations · combinations · permutations · iterations · possibilities
Extremely large in scope
- astronomicalRelating to outer space
- cosmicPertaining to the universe
- unfathomableBeyond comprehension or measurement
- incomprehensibleImpossible to understand
staggering · mind-boggling · inconceivable · unimaginable · colossal · enormous · vast · incalculable
quintillion
Ten to the eighteenth
- sextillionTen to twenty-first power
- septillionTen to the twenty-fourth
- nonillionTen to the thirtieth
decillion · googol · googolplex · quadrillion · trillion · billion · million · exponent · power · digit
atoms
Smallest elemental units
cells · bacteria · neurons · calculations · operations · combinations · permutations · iterations · possibilities · wavelengths
immense
Extremely large in scope
- astronomicalRelating to outer space
- cosmicPertaining to the universe
- unfathomableBeyond comprehension or measurement
incomprehensible · staggering · mind-boggling · inconceivable · unimaginable · colossal · enormous · vast · incalculable · immeasurable
- quantitiessome, many, few, amount, several
- eight prefixoctuplet, octahedron, octogenarian, octonary, octagram
- large numbersmillion, billion, trillion, quadrillion, quintillion