665384568 has 16 divisors (see below), whose sum is σ = 1663461480. Its totient is φ = 221794848.

The previous prime is 665384563. The next prime is 665384591. The reversal of 665384568 is 865483566.

It is a self number, because there is not a number n which added to its sum of digits gives 665384568.

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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13862155 + ... + 13862202.

Almost surely, 2^665384568 is an apocalyptic number.

It is an amenable number.

665384568 is an abundant number, since it is smaller than the sum of its proper divisors (998076912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665384568 is a wasteful number, since it uses less digits than its factorization.

665384568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27724366 (or 27724362 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 51.

The square root of 665384568 is about 25795.0492924514. The cubic root of 665384568 is about 873.0200971849.

The spelling of 665384568 in words is "six hundred sixty-five million, three hundred eighty-four thousand, five hundred sixty-eight".