5165809666109 has 2 divisors, whose sum is σ = 5165809666110. Its totient is φ = 5165809666108.

The previous prime is 5165809666033. The next prime is 5165809666123. The reversal of 5165809666109 is 9016669085615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4511333520100 + 654476146009 = 2123990^2 + 808997^2 .

It is a cyclic number.

It is not a de Polignac number, because 5165809666109 - 2⁸ = 5165809665853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5165809666139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2582904833054 + 2582904833055.

It is an arithmetic number, because the mean of its divisors is an integer number (2582904833055).

Almost surely, 2^{5165809666109} is an apocalyptic number.

It is an amenable number.

5165809666109 is a deficient number, since it is larger than the sum of its proper divisors (1).

5165809666109 is an equidigital number, since it uses as much as digits as its factorization.

5165809666109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20995200, while the sum is 62.

The spelling of 5165809666109 in words is "five trillion, one hundred sixty-five billion, eight hundred nine million, six hundred sixty-six thousand, one hundred nine".