11001111099991 has 4 divisors (see below), whose sum is σ = 11062569821400. Its totient is φ = 10939652378584.

The previous prime is 11001111099919. The next prime is 11001111100013. The reversal of 11001111099991 is 19999011110011.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11001111099991 - 2⁷ = 11001111099863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001111099691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30729360436 + ... + 30729360793.

It is an arithmetic number, because the mean of its divisors is an integer number (2765642455350).

Almost surely, 2^{11001111099991} is an apocalyptic number.

11001111099991 is a deficient number, since it is larger than the sum of its proper divisors (61458721409).

11001111099991 is an equidigital number, since it uses as much as digits as its factorization.

11001111099991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61458721408.

The product of its (nonzero) digits is 6561, while the sum is 43.

The spelling of 11001111099991 in words is "eleven trillion, one billion, one hundred eleven million, ninety-nine thousand, nine hundred ninety-one".