663968735218 has 8 divisors (see below), whose sum is σ = 996043784112. Its totient is φ = 331954140516.

The previous prime is 663968735201. The next prime is 663968735251. The reversal of 663968735218 is 812537869366.

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

It is a self number, because there is not a number n which added to its sum of digits gives 663968735218.

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, 15086080 + ... + 15130027.

It is an arithmetic number, because the mean of its divisors is an integer number (124505473014).

Almost surely, 2^663968735218 is an apocalyptic number.

663968735218 is a deficient number, since it is larger than the sum of its proper divisors (332075048894).

663968735218 is a wasteful number, since it uses less digits than its factorization.

663968735218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30227096.

The product of its digits is 78382080, while the sum is 64.

The spelling of 663968735218 in words is "six hundred sixty-three billion, nine hundred sixty-eight million, seven hundred thirty-five thousand, two hundred eighteen".