668001 has 8 divisors (see below), whose sum is σ = 899424. Its totient is φ = 440960.

The previous prime is 667999. The next prime is 668009. The reversal of 668001 is 100866.

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 668001 - 2¹ = 667999 is a prime.

It is a Curzon number.

668001 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (668009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 720 + ... + 1361.

It is an arithmetic number, because the mean of its divisors is an integer number (112428).

2⁶⁶⁸⁰⁰¹ is an apocalyptic number.

It is an amenable number.

668001 is a deficient number, since it is larger than the sum of its proper divisors (231423).

668001 is a wasteful number, since it uses less digits than its factorization.

668001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2191.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 668001 is about 817.3132814289. The cubic root of 668001 is about 87.4162900094.

Adding to 668001 its reverse (100866), we get a palindrome (768867).

The spelling of 668001 in words is "six hundred sixty-eight thousand, one".