161502039217 has 2 divisors, whose sum is σ = 161502039218. Its totient is φ = 161502039216.

The previous prime is 161502039197. The next prime is 161502039221. The reversal of 161502039217 is 712930205161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108682968241 + 52819070976 = 329671^2 + 229824^2 .

It is a cyclic number.

It is not a de Polignac number, because 161502039217 - 2¹⁹ = 161501514929 is a prime.

It is not a weakly prime, because it can be changed into another prime (161502049217) 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, 80751019608 + 80751019609.

It is an arithmetic number, because the mean of its divisors is an integer number (80751019609).

Almost surely, 2^161502039217 is an apocalyptic number.

It is an amenable number.

161502039217 is a deficient number, since it is larger than the sum of its proper divisors (1).

161502039217 is an equidigital number, since it uses as much as digits as its factorization.

161502039217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 37.

The spelling of 161502039217 in words is "one hundred sixty-one billion, five hundred two million, thirty-nine thousand, two hundred seventeen".