What is the value of this banknote?

The note is United Arab Republic (Egypt) 5 piastres 1961 but I'm not 100% sure about it.

Yes, it's a 1961 5 Piastres from United Arab Republic P180b.
The 2010 Standard Catalog of World Paper Money says $12 for UNC:

Quote: BizzoDoesYes, it's a 1961 5 Piastres from United Arab Republic P180b.
The 2010 Standard Catalog of World Paper Money says $12 for UNC:

Yes but my note has different text on the watermark, and it doesn't have pyramid watermark.

It might be a P180A, but the one picture I have has only "MINISTER OF TREASURY" on the back, not "MINISTER OF TREASURY AND PLANNING".
(Just discovered that this note is an error note)

Edit:
This link has the same text on the watermark as yours, and it's listed as P180b.
http://banknoteworld.com/banknote/egypt/5%20Piastres/1338

Also, just found this on identifying Egyptian notes:
http://www.banknote.ws/COLLECTION/countries/AFR/EGY/EGYidentifyer/EGYident5.htm

Appears to be quite useful actually, but identifies it as P180b also.

For completeness, here's the scan of P180A.

Quote: BizzoDoesFor completeness, here's the scan of P180A.

thank you but I still don't know the value so do you know the value?

The catalogue value for that note in VF condition in 2010 was $3 USD.
One is for sale on Ebay, UNC for $24 AUD http://www.ebay.co.uk/itm/Egypt-L1940-5-Piastre-P-180b-UNC-/390855666219

So I reckon yours isn't worth much more than $5 USD.