161752281617 has 2 divisors, whose sum is σ = 161752281618. Its totient is φ = 161752281616.

The previous prime is 161752281599. The next prime is 161752281637. The reversal of 161752281617 is 716182257161.

161752281617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157449446401 + 4302835216 = 396799^2 + 65596^2 .

It is a cyclic number.

It is not a de Polignac number, because 161752281617 - 2⁶ = 161752281553 is a prime.

It is a super-3 number, since 3×161752281617³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (161752281637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80876140808 + 80876140809.

It is an arithmetic number, because the mean of its divisors is an integer number (80876140809).

Almost surely, 2^161752281617 is an apocalyptic number.

It is an amenable number.

161752281617 is a deficient number, since it is larger than the sum of its proper divisors (1).

161752281617 is an equidigital number, since it uses as much as digits as its factorization.

161752281617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282240, while the sum is 47.

The spelling of 161752281617 in words is "one hundred sixty-one billion, seven hundred fifty-two million, two hundred eighty-one thousand, six hundred seventeen".