663781016 has 16 divisors (see below), whose sum is σ = 1264993440. Its totient is φ = 326449440.

The previous prime is 663781009. The next prime is 663781033. The reversal of 663781016 is 610187366.

663781016 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 679616 + ... + 680591.

It is an arithmetic number, because the mean of its divisors is an integer number (79062090).

Almost surely, 2^663781016 is an apocalyptic number.

It is an amenable number.

663781016 is a deficient number, since it is larger than the sum of its proper divisors (601212424).

663781016 is a wasteful number, since it uses less digits than its factorization.

663781016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360274 (or 1360270 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 663781016 is about 25763.9479893901. The cubic root of 663781016 is about 872.3182177536.

The spelling of 663781016 in words is "six hundred sixty-three million, seven hundred eighty-one thousand, sixteen".