11156438880 has 384 divisors, whose sum is σ = 41629593600. Its totient is φ = 2783987712.

The previous prime is 11156438863. The next prime is 11156438899. The reversal of 11156438880 is 8883465111.

11156438880 is a `hidden beast` number, since 1 + 1 + 1 + 564 + 3 + 8 + 8 + 80 = 666.

It is a super-2 number, since 2×11156438880² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4668726 + ... + 4671114.

It is an arithmetic number, because the mean of its divisors is an integer number (108410400).

Almost surely, 2^11156438880 is an apocalyptic number.

11156438880 is a gapful number since it is divisible by the number (10) 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 11156438880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20814796800).

11156438880 is an abundant number, since it is smaller than the sum of its proper divisors (30473154720).

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

11156438880 is a wasteful number, since it uses less digits than its factorization.

11156438880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2483 (or 2469 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The spelling of 11156438880 in words is "eleven billion, one hundred fifty-six million, four hundred thirty-eight thousand, eight hundred eighty".