665605330 has 32 divisors (see below), whose sum is σ = 1294164144. Its totient is φ = 245016576.

The previous prime is 665605327. The next prime is 665605331. The reversal of 665605330 is 33506566.

It is a happy number.

665605330 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 8 ways, for example, as 294156801 + 371448529 = 17151^2 + 19273^2 .

It is not an unprimeable number, because it can be changed into a prime (665605331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36214 + ... + 51406.

Almost surely, 2^665605330 is an apocalyptic number.

665605330 is a deficient number, since it is larger than the sum of its proper divisors (628558814).

665605330 is a wasteful number, since it uses less digits than its factorization.

665605330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15550.

The product of its (nonzero) digits is 48600, while the sum is 34.

The square root of 665605330 is about 25799.3280920260. The cubic root of 665605330 is about 873.1166370212.

The spelling of 665605330 in words is "six hundred sixty-five million, six hundred five thousand, three hundred thirty".