660061 has 2 divisors, whose sum is σ = 660062. Its totient is φ = 660060.

The previous prime is 660053. The next prime is 660067. The reversal of 660061 is 160066.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 416025 + 244036 = 645^2 + 494^2 .

It is a cyclic number.

It is not a de Polignac number, because 660061 - 2³ = 660053 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330030 + 330031.

It is an arithmetic number, because the mean of its divisors is an integer number (330031).

2⁶⁶⁰⁰⁶¹ is an apocalyptic number.

It is an amenable number.

660061 is a deficient number, since it is larger than the sum of its proper divisors (1).

660061 is an equidigital number, since it uses as much as digits as its factorization.

660061 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 660061 is about 812.4413825009. The cubic root of 660061 is about 87.0685591617.

The spelling of 660061 in words is "six hundred sixty thousand, sixty-one".