161605662015313 has 2 divisors, whose sum is σ = 161605662015314. Its totient is φ = 161605662015312.

The previous prime is 161605662015211. The next prime is 161605662015349. The reversal of 161605662015313 is 313510266506161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137263999904784 + 24341662110529 = 11715972^2 + 4933727^2 .

It is a cyclic number.

It is not a de Polignac number, because 161605662015313 - 2¹⁷ = 161605661884241 is a prime.

It is a super-2 number, since 2×161605662015313² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161605662015613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80802831007656 + 80802831007657.

It is an arithmetic number, because the mean of its divisors is an integer number (80802831007657).

Almost surely, 2^{161605662015313} is an apocalyptic number.

It is an amenable number.

161605662015313 is a deficient number, since it is larger than the sum of its proper divisors (1).

161605662015313 is an equidigital number, since it uses as much as digits as its factorization.

161605662015313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 583200, while the sum is 46.

The spelling of 161605662015313 in words is "one hundred sixty-one trillion, six hundred five billion, six hundred sixty-two million, fifteen thousand, three hundred thirteen".