663768566 has 8 divisors (see below), whose sum is σ = 1005511104. Its totient is φ = 328598200.

The previous prime is 663768541. The next prime is 663768571. The reversal of 663768566 is 665867366.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 1642790 + ... + 1643193.

It is an arithmetic number, because the mean of its divisors is an integer number (125688888).

Almost surely, 2^663768566 is an apocalyptic number.

663768566 is a deficient number, since it is larger than the sum of its proper divisors (341742538).

663768566 is a wasteful number, since it uses less digits than its factorization.

663768566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3286086.

The product of its digits is 6531840, while the sum is 53.

The square root of 663768566 is about 25763.7063715608. The cubic root of 663768566 is about 872.3127639320.

The spelling of 663768566 in words is "six hundred sixty-three million, seven hundred sixty-eight thousand, five hundred sixty-six".