665635230 has 144 divisors (see below), whose sum is σ = 1896158160. Its totient is φ = 161920512.

The previous prime is 665635219. The next prime is 665635237. The reversal of 665635230 is 32536566.

665635230 is a `hidden beast` number, since 66 + 563 + 5 + 2 + 30 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665635237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1627266 + ... + 1627674.

It is an arithmetic number, because the mean of its divisors is an integer number (13167765).

Almost surely, 2^665635230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665635230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (948079080).

665635230 is an abundant number, since it is smaller than the sum of its proper divisors (1230522930).

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

665635230 is a wasteful number, since it uses less digits than its factorization.

665635230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 36.

The square root of 665635230 is about 25799.9075579739. The cubic root of 665635230 is about 873.1297107329.

The spelling of 665635230 in words is "six hundred sixty-five million, six hundred thirty-five thousand, two hundred thirty".