665616020568 has 16 divisors (see below), whose sum is σ = 1664040051480. Its totient is φ = 221872006848.

The previous prime is 665616020561. The next prime is 665616020591. The reversal of 665616020568 is 865020616566.

It is a self number, because there is not a number n which added to its sum of digits gives 665616020568.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665616020561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13867000405 + ... + 13867000452.

Almost surely, 2^665616020568 is an apocalyptic number.

It is an amenable number.

665616020568 is an abundant number, since it is smaller than the sum of its proper divisors (998424030912).

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

665616020568 is a wasteful number, since it uses less digits than its factorization.

665616020568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27734000866 (or 27734000862 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 51.

The spelling of 665616020568 in words is "six hundred sixty-five billion, six hundred sixteen million, twenty thousand, five hundred sixty-eight".