668215933 has 8 divisors (see below), whose sum is σ = 833100480. Its totient is φ = 520687680.

The previous prime is 668215879. The next prime is 668215969. The reversal of 668215933 is 339512866.

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

It is a cyclic number.

It is not a de Polignac number, because 668215933 - 2⁹ = 668215421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 668215933.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668215973) 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 7 ways as a sum of consecutive naturals, for example, 4338988 + ... + 4339141.

It is an arithmetic number, because the mean of its divisors is an integer number (104137560).

Almost surely, 2^668215933 is an apocalyptic number.

It is an amenable number.

668215933 is a deficient number, since it is larger than the sum of its proper divisors (164884547).

668215933 is a wasteful number, since it uses less digits than its factorization.

668215933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8678147.

The product of its digits is 233280, while the sum is 43.

The square root of 668215933 is about 25849.8729784113. The cubic root of 668215933 is about 874.2566456161.

The spelling of 668215933 in words is "six hundred sixty-eight million, two hundred fifteen thousand, nine hundred thirty-three".