660260065109 has 2 divisors, whose sum is σ = 660260065110. Its totient is φ = 660260065108.

The previous prime is 660260065093. The next prime is 660260065121. The reversal of 660260065109 is 901560062066.

660260065109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 447531564484 + 212728500625 = 668978^2 + 461225^2 .

It is a cyclic number.

It is not a de Polignac number, because 660260065109 - 2⁴ = 660260065093 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660260065169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330130032554 + 330130032555.

It is an arithmetic number, because the mean of its divisors is an integer number (330130032555).

Almost surely, 2^660260065109 is an apocalyptic number.

It is an amenable number.

660260065109 is a deficient number, since it is larger than the sum of its proper divisors (1).

660260065109 is an equidigital number, since it uses as much as digits as its factorization.

660260065109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 41.

The spelling of 660260065109 in words is "six hundred sixty billion, two hundred sixty million, sixty-five thousand, one hundred nine".