How Many Zeros Can Fit On A Stamp?

Quote:
I believe the highest denomination is from Hungary: Scott #774 500,000 trillion pengo (or 500,000,000,000,000,000,000 pengo)

Toward the end, they had to go to AP, or adopengo. I know they had 40,000 AP on a stamp on the transportation issue, but don't remember what they went up to in the final AP issue.

There's a difference whether you are talking European or American Billions, Trillions and Quadrillions, since Europeans have Billiards, Trilliards and Quadrilliards.

Anyhow, the 10,000 AP low value transportation stamp is multiplied by the conversion factor 2 trilliard (European) to get 20,000,000,000,000,000,000,000,000 = 20 quadrillion (European) pengo or 20 followed by 24 zeros.

Hungary 26th July 1946. Scott # 783 and 784.
1 million adopengo and 5 million adopengo

2,000,000,000,000,000,000,000 x 5,000,000 =
10,000,000,000,000,000,000,000,000,000 pengo
= 10 to the 27th power pengo
or 10 quadrilliard (European) pengo if I've done it right.

The inflation was terminated Wednesday 31st July 1946, and the currency reform took place on 1st August 1946. The rate of exchange was: 1 Forint of 100 Filler for 400,000 quadrillion [pengo] = (4 x 10^29) or (4 times 10 to the 29th power).

(That would be 400 quadrilliard (European) pengo to 1 Forint.)

or divided by 2 trilliard (European) again to get the exchange rate in adopengo to Forints.

The conversion factor was printed as 2 trillion on one page and 2 trilliard on another. 2 Trilliard is correct, matching the number of zeros.