8643650857 has 16 divisors (see below), whose sum is σ = 9004695552. Its totient is φ = 8288055360.

The previous prime is 8643650849. The next prime is 8643650881. The reversal of 8643650857 is 7580563468.

It is a cyclic number.

It is not a de Polignac number, because 8643650857 - 2³ = 8643650849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8643650557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1861743 + ... + 1866379.

It is an arithmetic number, because the mean of its divisors is an integer number (562793472).

Almost surely, 2^8643650857 is an apocalyptic number.

It is an amenable number.

8643650857 is a deficient number, since it is larger than the sum of its proper divisors (361044695).

8643650857 is a wasteful number, since it uses less digits than its factorization.

8643650857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5208.

The product of its (nonzero) digits is 4838400, while the sum is 52.

The square root of 8643650857 is about 92971.2367186755. The cubic root of 8643650857 is about 2052.2601174262.

The spelling of 8643650857 in words is "eight billion, six hundred forty-three million, six hundred fifty thousand, eight hundred fifty-seven".