1605265271089 has 2 divisors, whose sum is σ = 1605265271090. Its totient is φ = 1605265271088.

The previous prime is 1605265271069. The next prime is 1605265271107. The reversal of 1605265271089 is 9801725625061.

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., 1278464398864 + 326800872225 = 1130692^2 + 571665^2 .

It is a cyclic number.

It is not a de Polignac number, because 1605265271089 - 2³³ = 1596675336497 is a prime.

It is not a weakly prime, because it can be changed into another prime (1605265271059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802632635544 + 802632635545.

It is an arithmetic number, because the mean of its divisors is an integer number (802632635545).

Almost surely, 2^{1605265271089} is an apocalyptic number.

It is an amenable number.

1605265271089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605265271089 is an equidigital number, since it uses as much as digits as its factorization.

1605265271089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1814400, while the sum is 52.

The spelling of 1605265271089 in words is "one trillion, six hundred five billion, two hundred sixty-five million, two hundred seventy-one thousand, eighty-nine".