668601 has 8 divisors (see below), whose sum is σ = 990560. Its totient is φ = 445716.

The previous prime is 668599. The next prime is 668609. The reversal of 668601 is 106866.

It is not a de Polignac number, because 668601 - 2¹ = 668599 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 24763 = 668601 / (6 + 6 + 8 + 6 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12355 + ... + 12408.

It is an arithmetic number, because the mean of its divisors is an integer number (123820).

2⁶⁶⁸⁶⁰¹ is an apocalyptic number.

It is an amenable number.

668601 is a deficient number, since it is larger than the sum of its proper divisors (321959).

668601 is a wasteful number, since it uses less digits than its factorization.

668601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24772 (or 24766 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 668601 is about 817.6802553566. The cubic root of 668601 is about 87.4424546800.

The spelling of 668601 in words is "six hundred sixty-eight thousand, six hundred one".