665383565 has 16 divisors (see below), whose sum is σ = 995483520. Its totient is φ = 414784320.

The previous prime is 665383561. The next prime is 665383573. The reversal of 665383565 is 565383566.

It is not a de Polignac number, because 665383565 - 2² = 665383561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665383561) 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, 863750 + ... + 864519.

It is an arithmetic number, because the mean of its divisors is an integer number (62217720).

Almost surely, 2^665383565 is an apocalyptic number.

It is an amenable number.

665383565 is a deficient number, since it is larger than the sum of its proper divisors (330099955).

665383565 is a wasteful number, since it uses less digits than its factorization.

665383565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1728292.

The product of its digits is 1944000, while the sum is 47.

The square root of 665383565 is about 25795.0298507290. The cubic root of 665383565 is about 873.0196585214.

Subtracting from 665383565 its reverse (565383566), we obtain a palindrome (99999999).

The spelling of 665383565 in words is "six hundred sixty-five million, three hundred eighty-three thousand, five hundred sixty-five".