665661030589 has 16 divisors (see below), whose sum is σ = 698168056320. Its totient is φ = 633844774080.

The previous prime is 665661030563. The next prime is 665661030607. The reversal of 665661030589 is 985030166566.

It is a cyclic number.

It is not a de Polignac number, because 665661030589 - 2¹¹ = 665661028541 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 (665661030509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210979 + ... + 1172959.

It is an arithmetic number, because the mean of its divisors is an integer number (43635503520).

Almost surely, 2^665661030589 is an apocalyptic number.

It is an amenable number.

665661030589 is a deficient number, since it is larger than the sum of its proper divisors (32507025731).

665661030589 is a wasteful number, since it uses less digits than its factorization.

665661030589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962340.

The product of its (nonzero) digits is 6998400, while the sum is 55.

The spelling of 665661030589 in words is "six hundred sixty-five billion, six hundred sixty-one million, thirty thousand, five hundred eighty-nine".