10991099911 has 16 divisors (see below), whose sum is σ = 12305462400. Its totient is φ = 9732376800.

The previous prime is 10991099909. The next prime is 10991099921. The reversal of 10991099911 is 11999019901.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 10991099911 - 2¹ = 10991099909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10991099921) 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, 6945 + ... + 148426.

It is an arithmetic number, because the mean of its divisors is an integer number (769091400).

Almost surely, 2^10991099911 is an apocalyptic number.

10991099911 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

10991099911 is a deficient number, since it is larger than the sum of its proper divisors (1314362489).

10991099911 is a wasteful number, since it uses less digits than its factorization.

10991099911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155550.

The product of its (nonzero) digits is 59049, while the sum is 49.

The spelling of 10991099911 in words is "ten billion, nine hundred ninety-one million, ninety-nine thousand, nine hundred eleven".