9856643712 has 64 divisors (see below), whose sum is σ = 26889362400. Its totient is φ = 3196744704.

The previous prime is 9856643711. The next prime is 9856643723. The reversal of 9856643712 is 2173466589.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (9856643711) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 332662 + ... + 361077.

Almost surely, 2^9856643712 is an apocalyptic number.

It is an amenable number.

9856643712 is an abundant number, since it is smaller than the sum of its proper divisors (17032718688).

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

9856643712 is a wasteful number, since it uses less digits than its factorization.

9856643712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693793 (or 693781 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 51.

The square root of 9856643712 is about 99280.6311019425. The cubic root of 9856643712 is about 2144.0900404006.

The spelling of 9856643712 in words is "nine billion, eight hundred fifty-six million, six hundred forty-three thousand, seven hundred twelve".