668212367 has 4 divisors (see below), whose sum is σ = 669191400. Its totient is φ = 667233336.

The previous prime is 668212351. The next prime is 668212379. The reversal of 668212367 is 763212866.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 668212367 - 2⁴ = 668212351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668512367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 488492 + ... + 489857.

It is an arithmetic number, because the mean of its divisors is an integer number (167297850).

Almost surely, 2^668212367 is an apocalyptic number.

668212367 is a deficient number, since it is larger than the sum of its proper divisors (979033).

668212367 is an equidigital number, since it uses as much as digits as its factorization.

668212367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979032.

The product of its digits is 145152, while the sum is 41.

The square root of 668212367 is about 25849.8040031254. The cubic root of 668212367 is about 874.2550904278.

The spelling of 668212367 in words is "six hundred sixty-eight million, two hundred twelve thousand, three hundred sixty-seven".