660601 has 2 divisors, whose sum is σ = 660602. Its totient is φ = 660600.

The previous prime is 660599. The next prime is 660607. The reversal of 660601 is 106066.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 409600 + 251001 = 640^2 + 501^2 .

It is a cyclic number.

It is not a de Polignac number, because 660601 - 2¹ = 660599 is a prime.

Together with 660599, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (660607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330300 + 330301.

It is an arithmetic number, because the mean of its divisors is an integer number (330301).

2⁶⁶⁰⁶⁰¹ is an apocalyptic number.

It is an amenable number.

660601 is a deficient number, since it is larger than the sum of its proper divisors (1).

660601 is an equidigital number, since it uses as much as digits as its factorization.

660601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 660601 is about 812.7736462263. The cubic root of 660601 is about 87.0922964658.

Adding to 660601 its reverse (106066), we get a palindrome (766667).

The spelling of 660601 in words is "six hundred sixty thousand, six hundred one".