665231252 has 18 divisors (see below), whose sum is σ = 1354221162. Its totient is φ = 285099024.

The previous prime is 665231221. The next prime is 665231257. The reversal of 665231252 is 252132566.

It can be written as a sum of positive squares in only one way, i.e., 447491716 + 217739536 = 21154^2 + 14756^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665231257) 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 5 ways as a sum of consecutive naturals, for example, 1696823 + ... + 1697214.

It is an arithmetic number, because the mean of its divisors is an integer number (75234509).

Almost surely, 2^665231252 is an apocalyptic number.

It is an amenable number.

665231252 is an abundant number, since it is smaller than the sum of its proper divisors (688989910).

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

665231252 is a wasteful number, since it uses less digits than its factorization.

665231252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3394055 (or 3394046 counting only the distinct ones).

The product of its digits is 21600, while the sum is 32.

The square root of 665231252 is about 25792.0773106782. The cubic root of 665231252 is about 872.9530391068.

The spelling of 665231252 in words is "six hundred sixty-five million, two hundred thirty-one thousand, two hundred fifty-two".