MySQL Error 1064 (42000). Insert failure on MySQL table
Please check here to see why posting images of text is not a good idea (can't cut and paste!). 
Always put the error code in your question's Title. Easier to search, easier to find!
Also, use the "Code sample" tool for code, not the "Block Quote". 
Finally, and to answer your question, your SQL appears to have an error - the name of the table you are querying is "9636354343_ whatsapp_friends" and not "9636354343_whatsapp_friends" - i.e. your code as posted has a space between the first underscore and the "whatsapp" part.  Always give a SHOW CREATE TABLE my_table\G (as text) with table definitions. 


In MySQL, you can have 64 characters in identifiers! That_is_more_than_enough_dont_you_think? (=40 characters!). I know what you did was an error, but MySQL (and other servers) do allow you to have spaces in identifiers, but putting the names in backticks (`) or double-quotes (") or whatever.

I cannot stress enough what madness this is - hic sunt leones!. Developers will always be asking "[Is that | Should that be] a space? "Is it a typo"? What happens if you accidentally put in two spaces - can be tricky to read and especially debug! Continue as you are doing, and use underscores to split identifiers to make them more readable!

Also, if you are in a multi-developer shop, pick a few conventions (you can Google best practices) and stick to them! Table names (singular or plural). Upper or Lower case - some servers enforce, others don't (with and/or without escaping). 

I (for example, and this is just me) always use singular table names (with the obvious exception of order) and lower case for my identifiers, UPPER case FOR my SQL; - it makes it easy to pick out the language parts from your own objects. 

Finally, no matter what you do, you should always use the comments facility available for tables and columns to let other developers know what the table/field is for and if they need to know anything special about the name, if it's not in accord with your convention!

p.s. welcome to the forum! p.p.s you can let people know you've replied to them by using @ in the text of your comment, i.e. for me, it's @Vérace!