11561122723 has 8 divisors (see below), whose sum is σ = 12066558336. Its totient is φ = 11066328000.

The previous prime is 11561122721. The next prime is 11561122813. The reversal of 11561122723 is 32722116511.

11561122723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11561122723 - 2¹ = 11561122721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11561122721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2658003 + ... + 2662348.

It is an arithmetic number, because the mean of its divisors is an integer number (1508319792).

Almost surely, 2^11561122723 is an apocalyptic number.

11561122723 is a deficient number, since it is larger than the sum of its proper divisors (505435613).

11561122723 is an equidigital number, since it uses as much as digits as its factorization.

11561122723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5320445.

The product of its digits is 5040, while the sum is 31.

The spelling of 11561122723 in words is "eleven billion, five hundred sixty-one million, one hundred twenty-two thousand, seven hundred twenty-three".