161242536397 has 2 divisors, whose sum is σ = 161242536398. Its totient is φ = 161242536396.

The previous prime is 161242536379. The next prime is 161242536493. The reversal of 161242536397 is 793635242161.

Together with previous prime (161242536379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128311538436 + 32930997961 = 358206^2 + 181469^2 .

It is an emirp because it is prime and its reverse (793635242161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161242536397 - 2³¹ = 159095052749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161242536397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161242536307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80621268198 + 80621268199.

It is an arithmetic number, because the mean of its divisors is an integer number (80621268199).

Almost surely, 2^161242536397 is an apocalyptic number.

It is an amenable number.

161242536397 is a deficient number, since it is larger than the sum of its proper divisors (1).

161242536397 is an equidigital number, since it uses as much as digits as its factorization.

161242536397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 49.

The spelling of 161242536397 in words is "one hundred sixty-one billion, two hundred forty-two million, five hundred thirty-six thousand, three hundred ninety-seven".