663678711 has 16 divisors (see below), whose sum is σ = 983903200. Its totient is φ = 442148544.

The previous prime is 663678709. The next prime is 663678733. The reversal of 663678711 is 117876366.

663678711 is a `hidden beast` number, since 6 + 636 + 7 + 8 + 7 + 1 + 1 = 666.

It is not a de Polignac number, because 663678711 - 2¹ = 663678709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663678781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35805 + ... + 51081.

It is an arithmetic number, because the mean of its divisors is an integer number (61493950).

Almost surely, 2^663678711 is an apocalyptic number.

663678711 is a deficient number, since it is larger than the sum of its proper divisors (320224489).

663678711 is a wasteful number, since it uses less digits than its factorization.

663678711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16895 (or 16889 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 663678711 is about 25761.9624834755. The cubic root of 663678711 is about 872.2734002117.

It can be divided in two parts, 66367 and 8711, that added together give a triangular number (75078 = T₃₈₇).

The spelling of 663678711 in words is "six hundred sixty-three million, six hundred seventy-eight thousand, seven hundred eleven".