161868672908617 has 2 divisors, whose sum is σ = 161868672908618. Its totient is φ = 161868672908616.

The previous prime is 161868672908609. The next prime is 161868672908651. The reversal of 161868672908617 is 716809276868161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151841640339216 + 10027032569401 = 12322404^2 + 3166549^2 .

It is a cyclic number.

It is not a de Polignac number, because 161868672908617 - 2³ = 161868672908609 is a prime.

It is a super-3 number, since 3×161868672908617³ (a number of 44 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (161868672908717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80934336454308 + 80934336454309.

It is an arithmetic number, because the mean of its divisors is an integer number (80934336454309).

Almost surely, 2^{161868672908617} is an apocalyptic number.

It is an amenable number.

161868672908617 is a deficient number, since it is larger than the sum of its proper divisors (1).

161868672908617 is an equidigital number, since it uses as much as digits as its factorization.

161868672908617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 585252864, while the sum is 76.

The spelling of 161868672908617 in words is "one hundred sixty-one trillion, eight hundred sixty-eight billion, six hundred seventy-two million, nine hundred eight thousand, six hundred seventeen".