161378168573 has 2 divisors, whose sum is σ = 161378168574. Its totient is φ = 161378168572.

The previous prime is 161378168537. The next prime is 161378168591. The reversal of 161378168573 is 375861873161.

Together with previous prime (161378168537) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115737400804 + 45640767769 = 340202^2 + 213637^2 .

It is an emirp because it is prime and its reverse (375861873161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161378168573 - 2¹⁶ = 161378103037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161378158573) 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, 80689084286 + 80689084287.

It is an arithmetic number, because the mean of its divisors is an integer number (80689084287).

Almost surely, 2^161378168573 is an apocalyptic number.

It is an amenable number.

161378168573 is a deficient number, since it is larger than the sum of its proper divisors (1).

161378168573 is an equidigital number, since it uses as much as digits as its factorization.

161378168573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 56.

The spelling of 161378168573 in words is "one hundred sixty-one billion, three hundred seventy-eight million, one hundred sixty-eight thousand, five hundred seventy-three".