11911840911 has 16 divisors (see below), whose sum is σ = 17692552800. Its totient is φ = 7920805824.

The previous prime is 11911840907. The next prime is 11911840949. The reversal of 11911840911 is 11904811911.

It is not a de Polignac number, because 11911840911 - 2² = 11911840907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11911840961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 556566 + ... + 577571.

It is an arithmetic number, because the mean of its divisors is an integer number (1105784550).

Almost surely, 2^11911840911 is an apocalyptic number.

11911840911 is a deficient number, since it is larger than the sum of its proper divisors (5780711889).

11911840911 is a wasteful number, since it uses less digits than its factorization.

11911840911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134535 (or 1134529 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 36.

The spelling of 11911840911 in words is "eleven billion, nine hundred eleven million, eight hundred forty thousand, nine hundred eleven".