665383566 has 64 divisors (see below), whose sum is σ = 1410048000. Its totient is φ = 209040480.

The previous prime is 665383561. The next prime is 665383573.

665383566 is nontrivially palindromic in base 10.

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 31 ways as a sum of consecutive naturals, for example, 1333185 + ... + 1333683.

It is an arithmetic number, because the mean of its divisors is an integer number (22032000).

Almost surely, 2^665383566 is an apocalyptic number.

665383566 is an abundant number, since it is smaller than the sum of its proper divisors (744664434).

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

665383566 is a wasteful number, since it uses less digits than its factorization.

665383566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709.

The product of its digits is 2332800, while the sum is 48.

The square root of 665383566 is about 25795.0298701126. The cubic root of 665383566 is about 873.0196589588.

The spelling of 665383566 in words is "six hundred sixty-five million, three hundred eighty-three thousand, five hundred sixty-six".