9865561180 has 48 divisors (see below), whose sum is σ = 20886465600. Its totient is φ = 3914152448.

The previous prime is 9865561169. The next prime is 9865561229. The reversal of 9865561180 is 811655689.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2551929 + ... + 2555791.

It is an arithmetic number, because the mean of its divisors is an integer number (435134700).

Almost surely, 2^9865561180 is an apocalyptic number.

It is an amenable number.

9865561180 is an abundant number, since it is smaller than the sum of its proper divisors (11020904420).

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

9865561180 is a wasteful number, since it uses less digits than its factorization.

9865561180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4878 (or 4876 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 49.

The square root of 9865561180 is about 99325.5313602701. The cubic root of 9865561180 is about 2144.7364433671.

The spelling of 9865561180 in words is "nine billion, eight hundred sixty-five million, five hundred sixty-one thousand, one hundred eighty".