11011111001011 has 4 divisors (see below), whose sum is σ = 12012121092024. Its totient is φ = 10010100910000.

The previous prime is 11011111000987. The next prime is 11011111001053. The reversal of 11011111001011 is 11010011111011.

It is a happy number.

11011111001011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 11011111001011 - 2⁵ = 11011111000979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11011111001911) 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, 500505045490 + ... + 500505045511.

It is an arithmetic number, because the mean of its divisors is an integer number (3003030273006).

Almost surely, 2^{11011111001011} is an apocalyptic number.

11011111001011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11011111001011 is a deficient number, since it is larger than the sum of its proper divisors (1001010091013).

11011111001011 is a wasteful number, since it uses less digits than its factorization.

11011111001011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001010091012.

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

Adding to 11011111001011 its reverse (11010011111011), we get a palindrome (22021122112022).

The spelling of 11011111001011 in words is "eleven trillion, eleven billion, one hundred eleven million, one thousand, eleven".