9855971689 has 4 divisors (see below), whose sum is σ = 9922119300. Its totient is φ = 9789824080.

The previous prime is 9855971687. The next prime is 9855971693. The reversal of 9855971689 is 9861795589.

9855971689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4797917289 + 5058054400 = 69267^2 + 71120^2 .

It is a cyclic number.

It is not a de Polignac number, because 9855971689 - 2¹ = 9855971687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9855971687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33073582 + ... + 33073879.

It is an arithmetic number, because the mean of its divisors is an integer number (2480529825).

Almost surely, 2^9855971689 is an apocalyptic number.

It is an amenable number.

9855971689 is a deficient number, since it is larger than the sum of its proper divisors (66147611).

9855971689 is a wasteful number, since it uses less digits than its factorization.

9855971689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66147610.

The product of its digits is 48988800, while the sum is 67.

The square root of 9855971689 is about 99277.2465824874. The cubic root of 9855971689 is about 2144.0413114888.

The spelling of 9855971689 in words is "nine billion, eight hundred fifty-five million, nine hundred seventy-one thousand, six hundred eighty-nine".