665245273 has 8 divisors (see below), whose sum is σ = 829396800. Its totient is φ = 518372880.

The previous prime is 665245253. The next prime is 665245279. The reversal of 665245273 is 372542566.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665245273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665245279) 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 7 ways as a sum of consecutive naturals, for example, 4319698 + ... + 4319851.

It is an arithmetic number, because the mean of its divisors is an integer number (103674600).

Almost surely, 2^665245273 is an apocalyptic number.

It is an amenable number.

665245273 is a deficient number, since it is larger than the sum of its proper divisors (164151527).

665245273 is a wasteful number, since it uses less digits than its factorization.

665245273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8639567.

The product of its digits is 302400, while the sum is 40.

The square root of 665245273 is about 25792.3491175193. The cubic root of 665245273 is about 872.9591721062.

The spelling of 665245273 in words is "six hundred sixty-five million, two hundred forty-five thousand, two hundred seventy-three".