11165856533 has 12 divisors (see below), whose sum is σ = 12100328928. Its totient is φ = 10298854800.

The previous prime is 11165856511. The next prime is 11165856557. The reversal of 11165856533 is 33565856111.

It is not a de Polignac number, because 11165856533 - 2⁶ = 11165856469 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11165856503) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 195608 + ... + 246158.

It is an arithmetic number, because the mean of its divisors is an integer number (1008360744).

Almost surely, 2^11165856533 is an apocalyptic number.

11165856533 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

11165856533 is a deficient number, since it is larger than the sum of its proper divisors (934472395).

11165856533 is a wasteful number, since it uses less digits than its factorization.

11165856533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51884 (or 51871 counting only the distinct ones).

The product of its digits is 324000, while the sum is 44.

The spelling of 11165856533 in words is "eleven billion, one hundred sixty-five million, eight hundred fifty-six thousand, five hundred thirty-three".