665224417685 has 16 divisors (see below), whose sum is σ = 816962494656. Its totient is φ = 519721308288.

The previous prime is 665224417679. The next prime is 665224417723. The reversal of 665224417685 is 586714422566.

665224417685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 665224417685 - 2⁶ = 665224417621 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 665224417685.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1141097 + ... + 1622513.

It is an arithmetic number, because the mean of its divisors is an integer number (51060155916).

Almost surely, 2^665224417685 is an apocalyptic number.

It is an amenable number.

665224417685 is a deficient number, since it is larger than the sum of its proper divisors (151738076971).

665224417685 is a wasteful number, since it uses less digits than its factorization.

665224417685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487892.

The product of its digits is 19353600, while the sum is 56.

The spelling of 665224417685 in words is "six hundred sixty-five billion, two hundred twenty-four million, four hundred seventeen thousand, six hundred eighty-five".