668663423 has 8 divisors (see below), whose sum is σ = 681685200. Its totient is φ = 655656768.

The previous prime is 668663419. The next prime is 668663441. The reversal of 668663423 is 324366866.

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 668663423 - 2² = 668663419 is a prime.

It is a super-2 number, since 2×668663423² = 894221546516153858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668663483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132083 + ... + 137051.

It is an arithmetic number, because the mean of its divisors is an integer number (85210650).

Almost surely, 2^668663423 is an apocalyptic number.

668663423 is a deficient number, since it is larger than the sum of its proper divisors (13021777).

668663423 is a wasteful number, since it uses less digits than its factorization.

668663423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7561.

The product of its digits is 746496, while the sum is 44.

The square root of 668663423 is about 25858.5270848902. The cubic root of 668663423 is about 874.4517590960.

The spelling of 668663423 in words is "six hundred sixty-eight million, six hundred sixty-three thousand, four hundred twenty-three".