665235312 has 80 divisors (see below), whose sum is σ = 1984372992. Its totient is φ = 188098560.

The previous prime is 665235301. The next prime is 665235377. The reversal of 665235312 is 213532566.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 22387 + ... + 42797.

Almost surely, 2^665235312 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 665235312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (992186496).

665235312 is an abundant number, since it is smaller than the sum of its proper divisors (1319137680).

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

665235312 is a wasteful number, since it uses less digits than its factorization.

665235312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20526 (or 20520 counting only the distinct ones).

The product of its digits is 32400, while the sum is 33.

The square root of 665235312 is about 25792.1560168979. The cubic root of 665235312 is about 872.9548150217.

Adding to 665235312 its reverse (213532566), we get a palindrome (878767878).

The spelling of 665235312 in words is "six hundred sixty-five million, two hundred thirty-five thousand, three hundred twelve".