665366464663566 has 32 divisors (see below), whose sum is σ = 1375089205042176. Its totient is φ = 214634343382200.

The previous prime is 665366464663559. The next prime is 665366464663603.

665366464663566 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 665366464663491 and 665366464663500.

It is a congruent number.

It is an unprimeable number.

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, 1861027840 + ... + 1861385331.

It is an arithmetic number, because the mean of its divisors is an integer number (42971537657568).

Almost surely, 2^{665366464663566} is an apocalyptic number.

665366464663566 is an abundant number, since it is smaller than the sum of its proper divisors (709722740378610).

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

665366464663566 is an equidigital number, since it uses as much as digits as its factorization.

665366464663566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3722413269 (or 3722413207 counting only the distinct ones).

The product of its digits is 36279705600, while the sum is 78.

The spelling of 665366464663566 in words is "six hundred sixty-five trillion, three hundred sixty-six billion, four hundred sixty-four million, six hundred sixty-three thousand, five hundred sixty-six".