161600665100869 has 2 divisors, whose sum is σ = 161600665100870. Its totient is φ = 161600665100868.

The previous prime is 161600665100867. The next prime is 161600665101091. The reversal of 161600665100869 is 968001566006161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154072018130625 + 7528646970244 = 12412575^2 + 2743838^2 .

It is a cyclic number.

It is not a de Polignac number, because 161600665100869 - 2¹ = 161600665100867 is a prime.

It is a super-2 number, since 2×161600665100869² (a number of 29 digits) contains 22 as substring.

Together with 161600665100867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161600665100867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80800332550434 + 80800332550435.

It is an arithmetic number, because the mean of its divisors is an integer number (80800332550435).

Almost surely, 2^{161600665100869} is an apocalyptic number.

It is an amenable number.

161600665100869 is a deficient number, since it is larger than the sum of its proper divisors (1).

161600665100869 is an equidigital number, since it uses as much as digits as its factorization.

161600665100869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2799360, while the sum is 55.

The spelling of 161600665100869 in words is "one hundred sixty-one trillion, six hundred billion, six hundred sixty-five million, one hundred thousand, eight hundred sixty-nine".