665225568 has 288 divisors, whose sum is σ = 2378678400. Its totient is φ = 179843328.

The previous prime is 665225563. The next prime is 665225569. The reversal of 665225568 is 865522566.

665225568 is a `hidden beast` number, since 6 + 65 + 2 + 25 + 568 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665225563) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 803971 + ... + 804797.

It is an arithmetic number, because the mean of its divisors is an integer number (8259300).

Almost surely, 2^665225568 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 665225568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1189339200).

665225568 is an abundant number, since it is smaller than the sum of its proper divisors (1713452832).

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

665225568 is a wasteful number, since it uses less digits than its factorization.

665225568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879 (or 858 counting only the distinct ones).

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

The square root of 665225568 is about 25791.9671215671. The cubic root of 665225568 is about 872.9505528139.

The spelling of 665225568 in words is "six hundred sixty-five million, two hundred twenty-five thousand, five hundred sixty-eight".