663218864678 has 8 divisors (see below), whose sum is σ = 1015994856672. Its totient is φ = 324553912456.

The previous prime is 663218864663. The next prime is 663218864683. The reversal of 663218864678 is 876468812366.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3527759825 + ... + 3527760012.

It is an arithmetic number, because the mean of its divisors is an integer number (126999357084).

Almost surely, 2^663218864678 is an apocalyptic number.

663218864678 is a deficient number, since it is larger than the sum of its proper divisors (352775991994).

663218864678 is a wasteful number, since it uses less digits than its factorization.

663218864678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7055519886.

The product of its digits is 111476736, while the sum is 65.

The spelling of 663218864678 in words is "six hundred sixty-three billion, two hundred eighteen million, eight hundred sixty-four thousand, six hundred seventy-eight".