The Internationally recognized official SI names for large and small numbers are shown below. These are taken from the Bureau International des Poids et Mesures (BIPM) website:
http://www.bipm.fr/en/si/prefixes.html
yotta (Y) | 1024 | 1 septillion | 1,000,000,000,000,000,000,000,000 |
zetta (Z) | 1021 | 1 sextillion | 1,000,000,000,000,000,000,000 |
exa (E) | 1018 | 1 quintillion | 1,000,000,000,000,000,000 |
peta (P) | 1015 | 1 quadrillion | 1,000,000,000,000,000 |
tera (T) | 1012 | 1 trillion | 1,000,000,000,000 |
giga (G) | 109 | 1 billion | 1,000,000,000 |
mega (M) | 106 | 1 million | 1,000,000 |
kilo (k) | 103 | 1 thousand | 1,000 |
hecto (h) | 102 | 1 hundred | 100 |
deka (da) | 10 | 1 ten | 10 |
1 | one unit | 1 | |
deci (d) | 10-1 | 1 tenth | .1 |
centi (c) | 10-2 | 1 hundredth | .01 |
milli (m) | 10-3 | 1 thousandth | .001 |
micro (µ) | 10-6 | 1 millionth | .000001 |
nano (n) | 10-9 | 1 billionth | .000000001 |
pico (p) | 10-12 | 1 trillionth | .000000000001 |
femto (f) | 10-15 | 1 quadrillionth | .000000000000001 |
atto (a) | 10-18 | 1 quintillionth | .000000000000000001 |
zepto (z) | 10-21 | 1 sextillionth | .000000000000000000001 |
yocto (y) | 10-24 | 1 septillionth | .000000000000000000000001 |