11155528661 has 2 divisors, whose sum is σ = 11155528662. Its totient is φ = 11155528660.

The previous prime is 11155528651. The next prime is 11155528697. The reversal of 11155528661 is 16682555111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8052370225 + 3103158436 = 89735^2 + 55706^2 .

It is an emirp because it is prime and its reverse (16682555111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11155528661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11155528651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5577764330 + 5577764331.

It is an arithmetic number, because the mean of its divisors is an integer number (5577764331).

Almost surely, 2^11155528661 is an apocalyptic number.

It is an amenable number.

11155528661 is a deficient number, since it is larger than the sum of its proper divisors (1).

11155528661 is an equidigital number, since it uses as much as digits as its factorization.

11155528661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72000, while the sum is 41.

The spelling of 11155528661 in words is "eleven billion, one hundred fifty-five million, five hundred twenty-eight thousand, six hundred sixty-one".