665240313 has 16 divisors (see below), whose sum is σ = 903853760. Its totient is φ = 435124224.

The previous prime is 665240299. The next prime is 665240333. The reversal of 665240313 is 313042566.

It is not a de Polignac number, because 665240313 - 2⁴ = 665240297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665240333) 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 15 ways as a sum of consecutive naturals, for example, 34398 + ... + 50136.

It is an arithmetic number, because the mean of its divisors is an integer number (56490860).

Almost surely, 2^665240313 is an apocalyptic number.

It is an amenable number.

665240313 is a deficient number, since it is larger than the sum of its proper divisors (238613447).

665240313 is a wasteful number, since it uses less digits than its factorization.

665240313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16008.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 665240313 is about 25792.2529647955. The cubic root of 665240313 is about 872.9570025364.

Adding to 665240313 its reverse (313042566), we get a palindrome (978282879).

The spelling of 665240313 in words is "six hundred sixty-five million, two hundred forty thousand, three hundred thirteen".