665252608 has 36 divisors (see below), whose sum is σ = 1352989008. Its totient is φ = 326343680.

The previous prime is 665252603. The next prime is 665252611. The reversal of 665252608 is 806252566.

It is a happy number.

It is a super-2 number, since 2×665252608² = 885122064901603328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (665252603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10948 + ... + 38083.

It is an arithmetic number, because the mean of its divisors is an integer number (37583028).

Almost surely, 2^665252608 is an apocalyptic number.

It is an amenable number.

665252608 is an abundant number, since it is smaller than the sum of its proper divisors (687736400).

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

665252608 is an equidigital number, since it uses as much as digits as its factorization.

665252608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49100 (or 49086 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

The square root of 665252608 is about 25792.4913104570. The cubic root of 665252608 is about 872.9623805128.

The spelling of 665252608 in words is "six hundred sixty-five million, two hundred fifty-two thousand, six hundred eight".