663778071 has 48 divisors (see below), whose sum is σ = 1122226560. Its totient is φ = 388372320.

The previous prime is 663778067. The next prime is 663778103. The reversal of 663778071 is 170877366.

It is a happy number.

663778071 is a `hidden beast` number, since 6 + 637 + 7 + 8 + 0 + 7 + 1 = 666.

663778071 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 663778071 - 2² = 663778067 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663778001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 73236 + ... + 81798.

It is an arithmetic number, because the mean of its divisors is an integer number (23379720).

Almost surely, 2^663778071 is an apocalyptic number.

663778071 is a deficient number, since it is larger than the sum of its proper divisors (458448489).

663778071 is a wasteful number, since it uses less digits than its factorization.

663778071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8618 (or 8606 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 45.

The square root of 663778071 is about 25763.8908358190. The cubic root of 663778071 is about 872.3169276790.

The spelling of 663778071 in words is "six hundred sixty-three million, seven hundred seventy-eight thousand, seventy-one".