668822391 has 12 divisors (see below), whose sum is σ = 966382560. Its totient is φ = 445740480.

The previous prime is 668822377. The next prime is 668822417. The reversal of 668822391 is 193228866.

It is not a de Polignac number, because 668822391 - 2¹¹ = 668820343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668822291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23970 + ... + 43728.

It is an arithmetic number, because the mean of its divisors is an integer number (80531880).

Almost surely, 2^668822391 is an apocalyptic number.

668822391 is a deficient number, since it is larger than the sum of its proper divisors (297560169).

668822391 is a wasteful number, since it uses less digits than its factorization.

668822391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23526 (or 23523 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 668822391 is about 25861.6007045194. The cubic root of 668822391 is about 874.5210509738.

The spelling of 668822391 in words is "six hundred sixty-eight million, eight hundred twenty-two thousand, three hundred ninety-one".