No, numbers are written as numbers.
Examples : 1600 Pennsylvania Avenue, 123 East 32nd Street
The exceptions are when street names have been established as being spelled out, as in Fifth Avenue, or a building name, One Canada Place.
When addressing a standard envelope, the correct location for the return address is the upper left corner of the envelope.
When addressing a side flapped envelope the side flap should be to to the right - regardless as to whether the person is addressing the envelope is left or right handed. So the postage stamp is on the same side as the opening flap.
You spell it envelope.
Envelopes is correct.
You only write on the envelope who you are addressing to. If you want to write to the wife, write down the wife's name only.
envelope
seal
El sobre.
Addressing an envelope to a male child use to be 'Master', but now it can be Mr.and the female Miss.
Enveloppe extraordinaire
The corrected spelling (a typo?) is "envelope."
When addressing a business envelope where the husband is Mr. and the wife is Dr., the proper way to format the names is to list the titles in alphabetical order. Therefore, you would address the envelope as "Dr. and Mr. [Last Name]." For example: "Dr. and Mr. Smith." This shows respect for both titles.