11981158688256 has 80 divisors (see below), whose sum is σ = 31926116859648. Its totient is φ = 3992773478400.

The previous prime is 11981158688207. The next prime is 11981158688267. The reversal of 11981158688256 is 65288685118911.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5577021 + ... + 7420611.

Almost surely, 2^{11981158688256} is an apocalyptic number.

11981158688256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11981158688256 is an abundant number, since it is smaller than the sum of its proper divisors (19944958171392).

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

11981158688256 is an equidigital number, since it uses as much as digits as its factorization.

11981158688256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1847843 (or 1847827 counting only the distinct ones).

The product of its digits is 66355200, while the sum is 69.

The spelling of 11981158688256 in words is "eleven trillion, nine hundred eighty-one billion, one hundred fifty-eight million, six hundred eighty-eight thousand, two hundred fifty-six".