551111111011 has 4 divisors (see below), whose sum is σ = 554411177712. Its totient is φ = 547811044312.

The previous prime is 551111111003. The next prime is 551111111029. The reversal of 551111111011 is 110111111155.

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 551111111011 - 2³ = 551111111003 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 551111111011.

It is not an unprimeable number, because it can be changed into a prime (551111111071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1650033100 + ... + 1650033433.

It is an arithmetic number, because the mean of its divisors is an integer number (138602794428).

Almost surely, 2^551111111011 is an apocalyptic number.

551111111011 is a deficient number, since it is larger than the sum of its proper divisors (3300066701).

551111111011 is a wasteful number, since it uses less digits than its factorization.

551111111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300066700.

The product of its (nonzero) digits is 25, while the sum is 19.

Adding to 551111111011 its reverse (110111111155), we get a palindrome (661222222166).

The spelling of 551111111011 in words is "five hundred fifty-one billion, one hundred eleven million, one hundred eleven thousand, eleven".