665384567 has 4 divisors (see below), whose sum is σ = 671273040. Its totient is φ = 659496096.

The previous prime is 665384563. The next prime is 665384591. The reversal of 665384567 is 765483566.

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

It is a cyclic number.

It is not a de Polignac number, because 665384567 - 2² = 665384563 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665384563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2944067 + ... + 2944292.

It is an arithmetic number, because the mean of its divisors is an integer number (167818260).

Almost surely, 2^665384567 is an apocalyptic number.

665384567 is a deficient number, since it is larger than the sum of its proper divisors (5888473).

665384567 is a wasteful number, since it uses less digits than its factorization.

665384567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5888472.

The product of its digits is 3628800, while the sum is 50.

The square root of 665384567 is about 25795.0492730679. The cubic root of 665384567 is about 873.0200967475.

The spelling of 665384567 in words is "six hundred sixty-five million, three hundred eighty-four thousand, five hundred sixty-seven".