663775816 has 32 divisors (see below), whose sum is σ = 1383350400. Its totient is φ = 296021440.

The previous prime is 663775807. The next prime is 663775841. The reversal of 663775816 is 618577366.

It is a self number, because there is not a number n which added to its sum of digits gives 663775816.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66496 + ... + 75823.

It is an arithmetic number, because the mean of its divisors is an integer number (43229700).

Almost surely, 2^663775816 is an apocalyptic number.

It is an amenable number.

663775816 is an abundant number, since it is smaller than the sum of its proper divisors (719574584).

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

663775816 is a wasteful number, since it uses less digits than its factorization.

663775816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142389 (or 142385 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 49.

The square root of 663775816 is about 25763.8470729819. The cubic root of 663775816 is about 872.3159398605.

The spelling of 663775816 in words is "six hundred sixty-three million, seven hundred seventy-five thousand, eight hundred sixteen".