9989549565 has 16 divisors (see below), whose sum is σ = 15989151168. Its totient is φ = 5325802496.

The previous prime is 9989549513. The next prime is 9989549567. The reversal of 9989549565 is 5659459899.

It is a cyclic number.

It is not a de Polignac number, because 9989549565 - 2⁶ = 9989549501 is a prime.

It is a super-2 number, since 2×9989549565² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9989549565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9989549567) 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, 79659 + ... + 162248.

It is an arithmetic number, because the mean of its divisors is an integer number (999321948).

Almost surely, 2^9989549565 is an apocalyptic number.

It is an amenable number.

9989549565 is a deficient number, since it is larger than the sum of its proper divisors (5999601603).

9989549565 is a wasteful number, since it uses less digits than its factorization.

9989549565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244668.

The product of its digits is 157464000, while the sum is 69.

The square root of 9989549565 is about 99947.7341664132. The cubic root of 9989549565 is about 2153.6839357912.

The spelling of 9989549565 in words is "nine billion, nine hundred eighty-nine million, five hundred forty-nine thousand, five hundred sixty-five".