665980089566 has 16 divisors (see below), whose sum is σ = 1089807402240. Its totient is φ = 302712166680.

The previous prime is 665980089553. The next prime is 665980089601.

665980089566 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 665980089496 and 665980089505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 934235 + ... + 1484841.

It is an arithmetic number, because the mean of its divisors is an integer number (68112962640).

Almost surely, 2^665980089566 is an apocalyptic number.

665980089566 is a deficient number, since it is larger than the sum of its proper divisors (423827312674).

665980089566 is a wasteful number, since it uses less digits than its factorization.

665980089566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605599.

The product of its (nonzero) digits is 167961600, while the sum is 68.

The spelling of 665980089566 in words is "six hundred sixty-five billion, nine hundred eighty million, eighty-nine thousand, five hundred sixty-six".