665533816 has 16 divisors (see below), whose sum is σ = 1321280640. Its totient is φ = 313192320.

The previous prime is 665533787. The next prime is 665533849. The reversal of 665533816 is 618335566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2446680 + ... + 2446951.

It is an arithmetic number, because the mean of its divisors is an integer number (82580040).

Almost surely, 2^665533816 is an apocalyptic number.

It is an amenable number.

665533816 is a deficient number, since it is larger than the sum of its proper divisors (655746824).

665533816 is a wasteful number, since it uses less digits than its factorization.

665533816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4893654 (or 4893650 counting only the distinct ones).

The product of its digits is 388800, while the sum is 43.

The square root of 665533816 is about 25797.9420884690. The cubic root of 665533816 is about 873.0853660880.

The spelling of 665533816 in words is "six hundred sixty-five million, five hundred thirty-three thousand, eight hundred sixteen".