665683646 has 32 divisors (see below), whose sum is σ = 1056706560. Its totient is φ = 314092800.

The previous prime is 665683631. The next prime is 665683679. The reversal of 665683646 is 646386566.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 665683594 and 665683603.

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, 426215 + ... + 427773.

It is an arithmetic number, because the mean of its divisors is an integer number (33022080).

Almost surely, 2^665683646 is an apocalyptic number.

665683646 is a deficient number, since it is larger than the sum of its proper divisors (391022914).

665683646 is a wasteful number, since it uses less digits than its factorization.

665683646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760.

The product of its digits is 3732480, while the sum is 50.

The square root of 665683646 is about 25800.8458388480. The cubic root of 665683646 is about 873.1508796962.

The spelling of 665683646 in words is "six hundred sixty-five million, six hundred eighty-three thousand, six hundred forty-six".