8561371656 has 64 divisors (see below), whose sum is σ = 21643355520. Its totient is φ = 2821875200.

The previous prime is 8561371613. The next prime is 8561371667. The reversal of 8561371656 is 6561731658.

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, 2380996 + ... + 2384588.

It is an arithmetic number, because the mean of its divisors is an integer number (338177430).

Almost surely, 2^8561371656 is an apocalyptic number.

It is an amenable number.

8561371656 is an abundant number, since it is smaller than the sum of its proper divisors (13081983864).

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

8561371656 is a wasteful number, since it uses less digits than its factorization.

8561371656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4686 (or 4682 counting only the distinct ones).

The product of its digits is 907200, while the sum is 48.

The square root of 8561371656 is about 92527.6804853553. The cubic root of 8561371656 is about 2045.7275011203.

The spelling of 8561371656 in words is "eight billion, five hundred sixty-one million, three hundred seventy-one thousand, six hundred fifty-six".