9889565660 has 72 divisors (see below), whose sum is σ = 22580053776. Its totient is φ = 3636672000.

The previous prime is 9889565659. The next prime is 9889565681. The reversal of 9889565660 is 665659889.

It is a junction number, because it is equal to n+sod(n) for n = 9889565593 and 9889565602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 842552 + ... + 854208.

It is an arithmetic number, because the mean of its divisors is an integer number (313611858).

Almost surely, 2^9889565660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9889565660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11290026888).

9889565660 is an abundant number, since it is smaller than the sum of its proper divisors (12690488116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9889565660 is a wasteful number, since it uses less digits than its factorization.

9889565660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11943 (or 11928 counting only the distinct ones).

The product of its (nonzero) digits is 27993600, while the sum is 62.

The square root of 9889565660 is about 99446.2953558352. The cubic root of 9889565660 is about 2146.4745294493.

The spelling of 9889565660 in words is "nine billion, eight hundred eighty-nine million, five hundred sixty-five thousand, six hundred sixty".