9989549566 has 16 divisors (see below), whose sum is σ = 15650279424. Its totient is φ = 4773191544.

The previous prime is 9989549513. The next prime is 9989549567. The reversal of 9989549566 is 6659459899.

It is a super-2 number, since 2×9989549566² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9989549495 and 9989549504.

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 7 ways as a sum of consecutive naturals, for example, 49890 + ... + 149893.

It is an arithmetic number, because the mean of its divisors is an integer number (978142464).

Almost surely, 2^9989549566 is an apocalyptic number.

9989549566 is a deficient number, since it is larger than the sum of its proper divisors (5660729858).

9989549566 is a wasteful number, since it uses less digits than its factorization.

9989549566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200895.

The product of its digits is 188956800, while the sum is 70.

The square root of 9989549566 is about 99947.7341714158. The cubic root of 9989549566 is about 2153.6839358630.

The spelling of 9989549566 in words is "nine billion, nine hundred eighty-nine million, five hundred forty-nine thousand, five hundred sixty-six".