161511115189 has 2 divisors, whose sum is σ = 161511115190. Its totient is φ = 161511115188.

The previous prime is 161511115151. The next prime is 161511115193. The reversal of 161511115189 is 981511115161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150489684900 + 11021430289 = 387930^2 + 104983^2 .

It is a cyclic number.

It is not a de Polignac number, because 161511115189 - 2⁷ = 161511115061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161511115109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80755557594 + 80755557595.

It is an arithmetic number, because the mean of its divisors is an integer number (80755557595).

Almost surely, 2^161511115189 is an apocalyptic number.

It is an amenable number.

161511115189 is a deficient number, since it is larger than the sum of its proper divisors (1).

161511115189 is an equidigital number, since it uses as much as digits as its factorization.

161511115189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 40.

The spelling of 161511115189 in words is "one hundred sixty-one billion, five hundred eleven million, one hundred fifteen thousand, one hundred eighty-nine".