668358213 has 16 divisors (see below), whose sum is σ = 945846720. Its totient is φ = 418347776.

The previous prime is 668358209. The next prime is 668358221. The reversal of 668358213 is 312853866.

It is a cyclic number.

It is not a de Polignac number, because 668358213 - 2² = 668358209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668358203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5731 + ... + 37007.

It is an arithmetic number, because the mean of its divisors is an integer number (59115420).

Almost surely, 2^668358213 is an apocalyptic number.

It is an amenable number.

668358213 is a deficient number, since it is larger than the sum of its proper divisors (277488507).

668358213 is a wasteful number, since it uses less digits than its factorization.

668358213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31716.

The product of its digits is 207360, while the sum is 42.

The square root of 668358213 is about 25852.6248764028. The cubic root of 668358213 is about 874.3186916314.

The spelling of 668358213 in words is "six hundred sixty-eight million, three hundred fifty-eight thousand, two hundred thirteen".