161765252213 has 2 divisors, whose sum is σ = 161765252214. Its totient is φ = 161765252212.

The previous prime is 161765252177. The next prime is 161765252239. The reversal of 161765252213 is 312252567161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110554920004 + 51210332209 = 332498^2 + 226297^2 .

It is a cyclic number.

It is not a de Polignac number, because 161765252213 - 2²⁰ = 161764203637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161765251213) 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, 80882626106 + 80882626107.

It is an arithmetic number, because the mean of its divisors is an integer number (80882626107).

Almost surely, 2^161765252213 is an apocalyptic number.

It is an amenable number.

161765252213 is a deficient number, since it is larger than the sum of its proper divisors (1).

161765252213 is an equidigital number, since it uses as much as digits as its factorization.

161765252213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 41.

The spelling of 161765252213 in words is "one hundred sixty-one billion, seven hundred sixty-five million, two hundred fifty-two thousand, two hundred thirteen".