668216782 has 8 divisors (see below), whose sum is σ = 1036888200. Its totient is φ = 322587384.

The previous prime is 668216779. The next prime is 668216789. The reversal of 668216782 is 287612866.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668216789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5760432 + ... + 5760547.

It is an arithmetic number, because the mean of its divisors is an integer number (129611025).

Almost surely, 2^668216782 is an apocalyptic number.

668216782 is a deficient number, since it is larger than the sum of its proper divisors (368671418).

668216782 is a wasteful number, since it uses less digits than its factorization.

668216782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11521010.

The product of its digits is 387072, while the sum is 46.

The square root of 668216782 is about 25849.8894001502. The cubic root of 668216782 is about 874.2570158774.

The spelling of 668216782 in words is "six hundred sixty-eight million, two hundred sixteen thousand, seven hundred eighty-two".