11565966256 has 20 divisors (see below), whose sum is σ = 24132833872. Its totient is φ = 5338138176.

The previous prime is 11565966239. The next prime is 11565966259. The reversal of 11565966256 is 65266956511.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (11565966259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27802596 + ... + 27803011.

Almost surely, 2^11565966256 is an apocalyptic number.

11565966256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11565966256 is an abundant number, since it is smaller than the sum of its proper divisors (12566867616).

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

11565966256 is a wasteful number, since it uses less digits than its factorization.

11565966256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55605628 (or 55605622 counting only the distinct ones).

The product of its digits is 2916000, while the sum is 52.

The spelling of 11565966256 in words is "eleven billion, five hundred sixty-five million, nine hundred sixty-six thousand, two hundred fifty-six".