11181539056 has 60 divisors (see below), whose sum is σ = 23145514128. Its totient is φ = 5223009792.

The previous prime is 11181539041. The next prime is 11181539063. The reversal of 11181539056 is 65093518111.

It is a super-2 number, since 2×11181539056² (a number of 21 digits) contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 672216 + ... + 688648.

Almost surely, 2^11181539056 is an apocalyptic number.

11181539056 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 11181539056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11572757064).

11181539056 is an abundant number, since it is smaller than the sum of its proper divisors (11963975072).

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

11181539056 is a wasteful number, since it uses less digits than its factorization.

11181539056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16550 (or 16501 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 40.

The spelling of 11181539056 in words is "eleven billion, one hundred eighty-one million, five hundred thirty-nine thousand, fifty-six".