11001100111111 has 4 divisors (see below), whose sum is σ = 12001200121224. Its totient is φ = 10001000101000.

The previous prime is 11001100111087. The next prime is 11001100111153. The reversal of 11001100111111 is 11111100110011.

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 11001100111111 - 2⁹ = 11001100110599 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001100111411) 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, 500050005040 + ... + 500050005061.

It is an arithmetic number, because the mean of its divisors is an integer number (3000300030306).

Almost surely, 2^{11001100111111} is an apocalyptic number.

11001100111111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11001100111111 is a deficient number, since it is larger than the sum of its proper divisors (1000100010113).

11001100111111 is a wasteful number, since it uses less digits than its factorization.

11001100111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000100010112.

The product of its (nonzero) digits is 1, while the sum is 10.

Adding to 11001100111111 its reverse (11111100110011), we get a palindrome (22112200221122).

It can be divided in two parts, 1100110011 and 1111, that multiplied together give a palindrome (1222222222221).

The spelling of 11001100111111 in words is "eleven trillion, one billion, one hundred million, one hundred eleven thousand, one hundred eleven".