11181665056 has 24 divisors (see below), whose sum is σ = 22292565120. Its totient is φ = 5520061248.

The previous prime is 11181665039. The next prime is 11181665057. The reversal of 11181665056 is 65056618111.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (11181665057) 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, 2209036 + ... + 2214091.

It is an arithmetic number, because the mean of its divisors is an integer number (928856880).

Almost surely, 2^11181665056 is an apocalyptic number.

11181665056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11181665056 is a deficient number, since it is larger than the sum of its proper divisors (11110900064).

11181665056 is an equidigital number, since it uses as much as digits as its factorization.

11181665056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4423216 (or 4423208 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 40.

The spelling of 11181665056 in words is "eleven billion, one hundred eighty-one million, six hundred sixty-five thousand, fifty-six".