Cardinal Mezzofanti (1774-1849), an Italian cardinal spoke more than 38 languages fluently. He never left Italy but could speak all the languages without accent.
According to funshun.com:
"Victor Hugo's 'Les Miserable' contains one of the longest sentences in the French language with 823 words without a period."
According to Council of Europe:
"Russia (148 million inhabitants) has by far the highest number of languages spoken on its territory: from 130 to 200 depending on the criteria."
"The non-European languages most widely used on European territory are Arabic, Chinese and Hindi, each with its own writing system."
According to Ethnologue the world's top 5 most spoken languages are:
1. Chinese (1213 million)
2. Spanish (329 million)
3. English (328 million)
4. Arabic (221 million)
5. Hindi (182 million)
Ethnologue estimates that there are 6909 living languages in the World.