
die Hausnummer
house number
The number that a building has on a street for identification.
Können Sie mir bitte Ihre Straße und Hausnummer geben?
Could you please give me your street and house number?
house number
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house number
The number that a building has on a street for identification.
Können Sie mir bitte Ihre Straße und Hausnummer geben?
Could you please give me your street and house number?

large number
Colloquial for an impressively high number, often an amount of money.
Zwei Millionen Euro für die Renovierung? Das ist mal eine Hausnummer!
Two million euros for the renovation? That's quite a large number!
The word is made up of 'Haus' (house) and 'Nummer' (number). The 's' in between is a linking s that connects the two words. Literally, it is the number of a house.
Die Hausnummer 10 befindet sich auf der anderen Straßenseite.
House number 10 is on the other side of the street.
In the context of addresses, 'Hausnummer' (house number) is almost always mentioned together with the street. The typical question is: 'Wie ist Ihre Straße und Hausnummer?' (What is your street and house number?).
Bitte geben Sie bei der Bestellung Ihre vollständige Adresse mit Straße und Hausnummer an.
Please provide your full address, including street and house number, when ordering.
The second meaning is used only colloquially to comment on a surprisingly high number, usually a price. It expresses astonishment or even admiration.
10.000 Euro für ein Fahrrad? Das ist eine echte Hausnummer.
10,000 euros for a bicycle? That's a really large number.
In the colloquial meaning, the word is often used in the fixed expression 'Das ist (mal) eine Hausnummer!' (That's quite something / that's a big number!). It functions as a commenting exclamation.
Er will 50 Kilometer am Stück laufen. Das ist mal eine Hausnummer!
He wants to run 50 kilometers in one go. That's quite something!