6665505408 has 192 divisors, whose sum is σ = 19701601920. Its totient is φ = 2162073600.

The previous prime is 6665505383. The next prime is 6665505421. The reversal of 6665505408 is 8045055666.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (192).

It is an unprimeable number.

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, 16622008 + ... + 16622408.

It is an arithmetic number, because the mean of its divisors is an integer number (102612510).

Almost surely, 2^6665505408 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 6665505408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9850800960).

6665505408 is an abundant number, since it is smaller than the sum of its proper divisors (13036096512).

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

6665505408 is a wasteful number, since it uses less digits than its factorization.

6665505408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775 (or 760 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

The square root of 6665505408 is about 81642.5465550898. The cubic root of 6665505408 is about 1881.9627727920.

The spelling of 6665505408 in words is "six billion, six hundred sixty-five million, five hundred five thousand, four hundred eight".