665383567 has 4 divisors (see below), whose sum is σ = 667523376. Its totient is φ = 663243760.

The previous prime is 665383561. The next prime is 665383573. The reversal of 665383567 is 765383566.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (665383561) and next prime (665383573).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665383567 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 665383567.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1069438 + ... + 1070059.

It is an arithmetic number, because the mean of its divisors is an integer number (166880844).

Almost surely, 2^665383567 is an apocalyptic number.

665383567 is a deficient number, since it is larger than the sum of its proper divisors (2139809).

665383567 is a wasteful number, since it uses less digits than its factorization.

665383567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2139808.

The product of its digits is 2721600, while the sum is 49.

The square root of 665383567 is about 25795.0298894962. The cubic root of 665383567 is about 873.0196593961.

Subtracting 665383567 from its reverse (765383566), we obtain a palindrome (99999999).

The spelling of 665383567 in words is "six hundred sixty-five million, three hundred eighty-three thousand, five hundred sixty-seven".