161164833889 has 2 divisors, whose sum is σ = 161164833890. Its totient is φ = 161164833888.

The previous prime is 161164833871. The next prime is 161164833917. The reversal of 161164833889 is 988338461161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109572254289 + 51592579600 = 331017^2 + 227140^2 .

It is an emirp because it is prime and its reverse (988338461161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161164833889 - 2⁵ = 161164833857 is a prime.

It is not a weakly prime, because it can be changed into another prime (161164833289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80582416944 + 80582416945.

It is an arithmetic number, because the mean of its divisors is an integer number (80582416945).

Almost surely, 2^161164833889 is an apocalyptic number.

It is an amenable number.

161164833889 is a deficient number, since it is larger than the sum of its proper divisors (1).

161164833889 is an equidigital number, since it uses as much as digits as its factorization.

161164833889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5971968, while the sum is 58.

The spelling of 161164833889 in words is "one hundred sixty-one billion, one hundred sixty-four million, eight hundred thirty-three thousand, eight hundred eighty-nine".