11956581011 has 8 divisors (see below), whose sum is σ = 12137265600. Its totient is φ = 11775962088.

The previous prime is 11956580959. The next prime is 11956581017. The reversal of 11956581011 is 11018565911.

It is a happy number.

11956581011 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 a de Polignac number, because none of the positive numbers 2^k-11956581011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11956581017) 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, 449300 + ... + 475166.

It is an arithmetic number, because the mean of its divisors is an integer number (1517158200).

Almost surely, 2^11956581011 is an apocalyptic number.

11956581011 is a deficient number, since it is larger than the sum of its proper divisors (180684589).

11956581011 is an equidigital number, since it uses as much as digits as its factorization.

11956581011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32833.

The product of its (nonzero) digits is 10800, while the sum is 38.

The spelling of 11956581011 in words is "eleven billion, nine hundred fifty-six million, five hundred eighty-one thousand, eleven".