11491127856 has 160 divisors (see below), whose sum is σ = 35960962240. Its totient is φ = 3535591680.

The previous prime is 11491127801. The next prime is 11491127863. The reversal of 11491127856 is 65872119411.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 442266 + ... + 467526.

It is an arithmetic number, because the mean of its divisors is an integer number (224756014).

Almost surely, 2^11491127856 is an apocalyptic number.

11491127856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11491127856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17980481120).

11491127856 is an abundant number, since it is smaller than the sum of its proper divisors (24469834384).

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

11491127856 is an equidigital number, since it uses as much as digits as its factorization.

11491127856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25303 (or 25279 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The spelling of 11491127856 in words is "eleven billion, four hundred ninety-one million, one hundred twenty-seven thousand, eight hundred fifty-six".