10991322959 has 4 divisors (see below), whose sum is σ = 10991855616. Its totient is φ = 10990790304.

The previous prime is 10991322949. The next prime is 10991323001. The reversal of 10991322959 is 95922319901.

It is a happy number.

10991322959 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 a de Polignac number, because none of the positive numbers 2^k-10991322959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10991322949) 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 3 ways as a sum of consecutive naturals, for example, 234074 + ... + 277079.

It is an arithmetic number, because the mean of its divisors is an integer number (2747963904).

Almost surely, 2^10991322959 is an apocalyptic number.

10991322959 is a deficient number, since it is larger than the sum of its proper divisors (532657).

10991322959 is an equidigital number, since it uses as much as digits as its factorization.

10991322959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532656.

The product of its (nonzero) digits is 393660, while the sum is 50.

The spelling of 10991322959 in words is "ten billion, nine hundred ninety-one million, three hundred twenty-two thousand, nine hundred fifty-nine".