11956566528 has 60 divisors (see below), whose sum is σ = 34507473858. Its totient is φ = 3985520640.

The previous prime is 11956566481. The next prime is 11956566529. The reversal of 11956566528 is 82566565911.

11956566528 is a `hidden beast` number, since 1 + 1 + 9 + 56 + 5 + 66 + 528 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11882744064 + 73822464 = 109008^2 + 8592^2 .

It is not an unprimeable number, because it can be changed into a prime (11956566529) 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 5 ways as a sum of consecutive naturals, for example, 1292763 + ... + 1301978.

Almost surely, 2^11956566528 is an apocalyptic number.

11956566528 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

11956566528 is an abundant number, since it is smaller than the sum of its proper divisors (22550907330).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11956566528 is an equidigital number, since it uses as much as digits as its factorization.

11956566528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2594765 (or 2594746 counting only the distinct ones).

The product of its digits is 3888000, while the sum is 54.

The spelling of 11956566528 in words is "eleven billion, nine hundred fifty-six million, five hundred sixty-six thousand, five hundred twenty-eight".