9865445689 has 24 divisors (see below), whose sum is σ = 10970878464. Its totient is φ = 8863932000.

The previous prime is 9865445687. The next prime is 9865445699.

9865445689 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 9865445689 - 2¹ = 9865445687 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9865445689.

It is not an unprimeable number, because it can be changed into a prime (9865445687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9075304 + ... + 9076390.

It is an arithmetic number, because the mean of its divisors is an integer number (457119936).

Almost surely, 2^9865445689 is an apocalyptic number.

It is an amenable number.

9865445689 is a deficient number, since it is larger than the sum of its proper divisors (1105432775).

9865445689 is a wasteful number, since it uses less digits than its factorization.

9865445689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1917 (or 1906 counting only the distinct ones).

The product of its digits is 74649600, while the sum is 64.

The square root of 9865445689 is about 99324.9499823685. The cubic root of 9865445689 is about 2144.7280742293.

It can be divided in two parts, 9865 and 445689, that added together give a palindrome (455554).

The spelling of 9865445689 in words is "nine billion, eight hundred sixty-five million, four hundred forty-five thousand, six hundred eighty-nine".