665664344 has 32 divisors (see below), whose sum is σ = 1303866720. Its totient is φ = 317999616.

The previous prime is 665664319. The next prime is 665664361. The reversal of 665664344 is 443466566.

It is a happy number.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 665664295 and 665664304.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233552 + ... + 236384.

It is an arithmetic number, because the mean of its divisors is an integer number (40745835).

Almost surely, 2^665664344 is an apocalyptic number.

It is an amenable number.

665664344 is a deficient number, since it is larger than the sum of its proper divisors (638202376).

665664344 is a wasteful number, since it uses less digits than its factorization.

665664344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4139 (or 4135 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 44.

The square root of 665664344 is about 25800.4717786323. The cubic root of 665664344 is about 873.1424403916.

The spelling of 665664344 in words is "six hundred sixty-five million, six hundred sixty-four thousand, three hundred forty-four".