Is it permissible to repeat some adhkar, such as "La ilaha illa Allah wahdahu la sharika lah..." and "Subhan Allah wa bihamdihi..." 100 times? And what is the classification of the hadith "The world turned away from me..." which mentions the dhikr "Subhan Allah wa bihamdihi Subhan Allah al-Azim astaghfirullah a hundred times between the appearance of dawn and praying Fajr"?

The invocations (dhikr) mentioned in the question are legitimate and established in the Sunnah, but restricting them to a specific number has not been authentically reported in the Sunnah and is an innovation. It is recommended to refer to reliable books of invocations such as "Al-Adhkar" by An-Nawawi, "Al-Wabil Al-Sayyib" by Ibn Al-Qayyim, "Al-Kalim Al-Tayyib" by Ibn Taymiyyah, and "Hisn Al-Muslim." As for the hadith mentioned, it is not authentically attributed to the Prophet, peace and blessings be upon him, as its chain of narration is very weak.