66655470709 has 2 divisors, whose sum is σ = 66655470710. Its totient is φ = 66655470708.

The previous prime is 66655470701. The next prime is 66655470767. The reversal of 66655470709 is 90707455666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56321731684 + 10333739025 = 237322^2 + 101655^2 .

It is a cyclic number.

It is not a de Polignac number, because 66655470709 - 2³ = 66655470701 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66655470709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66655470701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33327735354 + 33327735355.

It is an arithmetic number, because the mean of its divisors is an integer number (33327735355).

Almost surely, 2^66655470709 is an apocalyptic number.

It is an amenable number.

66655470709 is a deficient number, since it is larger than the sum of its proper divisors (1).

66655470709 is an equidigital number, since it uses as much as digits as its factorization.

66655470709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9525600, while the sum is 55.

The spelling of 66655470709 in words is "sixty-six billion, six hundred fifty-five million, four hundred seventy thousand, seven hundred nine".