161600665101409 has 2 divisors, whose sum is σ = 161600665101410. Its totient is φ = 161600665101408.

The previous prime is 161600665101377. The next prime is 161600665101439. The reversal of 161600665101409 is 904101566006161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103283723379600 + 58316941721809 = 10162860^2 + 7636553^2 .

It is a cyclic number.

It is not a de Polignac number, because 161600665101409 - 2⁵ = 161600665101377 is a prime.

It is a super-2 number, since 2×161600665101409² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161600665101439) 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, 80800332550704 + 80800332550705.

It is an arithmetic number, because the mean of its divisors is an integer number (80800332550705).

Almost surely, 2^{161600665101409} is an apocalyptic number.

It is an amenable number.

161600665101409 is a deficient number, since it is larger than the sum of its proper divisors (1).

161600665101409 is an equidigital number, since it uses as much as digits as its factorization.

161600665101409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 46.

The spelling of 161600665101409 in words is "one hundred sixty-one trillion, six hundred billion, six hundred sixty-five million, one hundred one thousand, four hundred nine".