2165104525609 has 2 divisors, whose sum is σ = 2165104525610. Its totient is φ = 2165104525608.

The previous prime is 2165104525607. The next prime is 2165104525643. The reversal of 2165104525609 is 9065254015612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1673990893584 + 491113632025 = 1293828^2 + 700795^2 .

It is a cyclic number.

It is not a de Polignac number, because 2165104525609 - 2¹ = 2165104525607 is a prime.

Together with 2165104525607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2165104525607) 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, 1082552262804 + 1082552262805.

It is an arithmetic number, because the mean of its divisors is an integer number (1082552262805).

Almost surely, 2^{2165104525609} is an apocalyptic number.

It is an amenable number.

2165104525609 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165104525609 is an equidigital number, since it uses as much as digits as its factorization.

2165104525609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648000, while the sum is 46.

The spelling of 2165104525609 in words is "two trillion, one hundred sixty-five billion, one hundred four million, five hundred twenty-five thousand, six hundred nine".