665136305 has 8 divisors (see below), whose sum is σ = 845114472. Its totient is φ = 500808448.

The previous prime is 665136293. The next prime is 665136319. The reversal of 665136305 is 503631566.

665136305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 145250704 + 519885601 = 12052^2 + 22801^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 665136305 - 2¹⁰ = 665135281 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3912482 + ... + 3912651.

It is an arithmetic number, because the mean of its divisors is an integer number (105639309).

Almost surely, 2^665136305 is an apocalyptic number.

It is an amenable number.

665136305 is a deficient number, since it is larger than the sum of its proper divisors (179978167).

665136305 is a wasteful number, since it uses less digits than its factorization.

665136305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7825155.

The product of its (nonzero) digits is 48600, while the sum is 35.

The square root of 665136305 is about 25790.2366216365. The cubic root of 665136305 is about 872.9115055722.

The spelling of 665136305 in words is "six hundred sixty-five million, one hundred thirty-six thousand, three hundred five".