11156565560 has 32 divisors (see below), whose sum is σ = 28688312160. Its totient is φ = 3825108096.

The previous prime is 11156565557. The next prime is 11156565569. The reversal of 11156565560 is 6556565111.

It is a super-2 number, since 2×11156565560² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11156565569) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 19922159 + ... + 19922718.

It is an arithmetic number, because the mean of its divisors is an integer number (896509755).

Almost surely, 2^11156565560 is an apocalyptic number.

11156565560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11156565560 is an abundant number, since it is smaller than the sum of its proper divisors (17531746600).

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

11156565560 is a wasteful number, since it uses less digits than its factorization.

11156565560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39844895 (or 39844891 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 41.

The spelling of 11156565560 in words is "eleven billion, one hundred fifty-six million, five hundred sixty-five thousand, five hundred sixty".