9856704907989 has 6 divisors (see below), whose sum is σ = 14237462644886. Its totient is φ = 6571136605320.

The previous prime is 9856704907979. The next prime is 9856704907997. The reversal of 9856704907989 is 9897094076589.

9856704907989 is a `hidden beast` number, since 9 + 8 + 56 + 7 + 0 + 490 + 79 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 9201163688964 + 655541219025 = 3033342^2 + 809655^2 .

It is not a de Polignac number, because 9856704907989 - 2⁵ = 9856704907957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9856704907909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 547594717102 + ... + 547594717119.

Almost surely, 2^{9856704907989} is an apocalyptic number.

It is an amenable number.

9856704907989 is a deficient number, since it is larger than the sum of its proper divisors (4380757736897).

9856704907989 is a wasteful number, since it uses less digits than its factorization.

9856704907989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095189434227 (or 1095189434224 counting only the distinct ones).

The product of its (nonzero) digits is 2469035520, while the sum is 81.

The spelling of 9856704907989 in words is "nine trillion, eight hundred fifty-six billion, seven hundred four million, nine hundred seven thousand, nine hundred eighty-nine".