8561385616 has 80 divisors (see below), whose sum is σ = 19441969920. Its totient is φ = 3576545280.

The previous prime is 8561385587. The next prime is 8561385641. The reversal of 8561385616 is 6165831658.

It is a self number, because there is not a number n which added to its sum of digits gives 8561385616.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 701680 + ... + 713776.

It is an arithmetic number, because the mean of its divisors is an integer number (243024624).

Almost surely, 2^8561385616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8561385616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9720984960).

8561385616 is an abundant number, since it is smaller than the sum of its proper divisors (10880584304).

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

8561385616 is a wasteful number, since it uses less digits than its factorization.

8561385616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12272 (or 12266 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 49.

The square root of 8561385616 is about 92527.7559222096. The cubic root of 8561385616 is about 2045.7286130270.

The spelling of 8561385616 in words is "eight billion, five hundred sixty-one million, three hundred eighty-five thousand, six hundred sixteen".