6609540868 has 48 divisors (see below), whose sum is σ = 13937996800. Its totient is φ = 2679104160.

The previous prime is 6609540851. The next prime is 6609540877. The reversal of 6609540868 is 8680459066.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 319273 + ... + 339343.

Almost surely, 2^6609540868 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 6609540868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6968998400).

6609540868 is an abundant number, since it is smaller than the sum of its proper divisors (7328455932).

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

6609540868 is a wasteful number, since it uses less digits than its factorization.

6609540868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20720 (or 20718 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 52.

The square root of 6609540868 is about 81299.0828238548. The cubic root of 6609540868 is about 1876.6808860918.

The spelling of 6609540868 in words is "six billion, six hundred nine million, five hundred forty thousand, eight hundred sixty-eight".