663385716 has 108 divisors (see below), whose sum is σ = 1971288228. Its totient is φ = 187536384.

The previous prime is 663385687. The next prime is 663385729. The reversal of 663385716 is 617583366.

663385716 is a `hidden beast` number, since 6 + 633 + 8 + 5 + 7 + 1 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 231161616 + 432224100 = 15204^2 + 20790^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 169170 + ... + 173046.

Almost surely, 2^663385716 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663385716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (985644114).

663385716 is an abundant number, since it is smaller than the sum of its proper divisors (1307902512).

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

663385716 is a wasteful number, since it uses less digits than its factorization.

663385716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3998 (or 3986 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 663385716 is about 25756.2752741929. The cubic root of 663385716 is about 872.1450201391.

The spelling of 663385716 in words is "six hundred sixty-three million, three hundred eighty-five thousand, seven hundred sixteen".