660769 has 2 divisors, whose sum is σ = 660770. Its totient is φ = 660768.

The previous prime is 660757. The next prime is 660787. The reversal of 660769 is 967066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 374544 + 286225 = 612^2 + 535^2 .

It is a cyclic number.

It is not a de Polignac number, because 660769 - 2¹³ = 652577 is a prime.

It is a super-2 number, since 2×660769² = 873231342722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (660719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330384 + 330385.

It is an arithmetic number, because the mean of its divisors is an integer number (330385).

2⁶⁶⁰⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

660769 is a deficient number, since it is larger than the sum of its proper divisors (1).

660769 is an equidigital number, since it uses as much as digits as its factorization.

660769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 660769 is about 812.8769894640. The cubic root of 660769 is about 87.0996787665.

The spelling of 660769 in words is "six hundred sixty thousand, seven hundred sixty-nine".