665443344566 has 64 divisors (see below), whose sum is σ = 1353463243776. Its totient is φ = 236950704000.

The previous prime is 665443344523. The next prime is 665443344593.

665443344566 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1443290 + ... + 1847693.

It is an arithmetic number, because the mean of its divisors is an integer number (21147863184).

Almost surely, 2^665443344566 is an apocalyptic number.

665443344566 is an abundant number, since it is smaller than the sum of its proper divisors (688019899210).

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

665443344566 is a wasteful number, since it uses less digits than its factorization.

665443344566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3291117.

The product of its digits is 74649600, while the sum is 56.

The spelling of 665443344566 in words is "six hundred sixty-five billion, four hundred forty-three million, three hundred forty-four thousand, five hundred sixty-six".