11165861880 has 128 divisors (see below), whose sum is σ = 38503080000. Its totient is φ = 2874880512.

The previous prime is 11165861849. The next prime is 11165861891. The reversal of 11165861880 is 8816856111.

It is a happy number.

11165861880 is a `hidden beast` number, since 11 + 16 + 5 + 8 + 618 + 8 + 0 = 666.

11165861880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146935 + ... + 209574.

Almost surely, 2^11165861880 is an apocalyptic number.

11165861880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11165861880 is an abundant number, since it is smaller than the sum of its proper divisors (27337218120).

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

11165861880 is a wasteful number, since it uses less digits than its factorization.

11165861880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356558 (or 356548 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 45.

The spelling of 11165861880 in words is "eleven billion, one hundred sixty-five million, eight hundred sixty-one thousand, eight hundred eighty".