161235636229 has 2 divisors, whose sum is σ = 161235636230. Its totient is φ = 161235636228.

The previous prime is 161235636157. The next prime is 161235636271. The reversal of 161235636229 is 922636532161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155474067204 + 5761569025 = 394302^2 + 75905^2 .

It is a cyclic number.

It is not a de Polignac number, because 161235636229 - 2¹⁹ = 161235111941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161235636829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80617818114 + 80617818115.

It is an arithmetic number, because the mean of its divisors is an integer number (80617818115).

Almost surely, 2^161235636229 is an apocalyptic number.

It is an amenable number.

161235636229 is a deficient number, since it is larger than the sum of its proper divisors (1).

161235636229 is an equidigital number, since it uses as much as digits as its factorization.

161235636229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 46.

The spelling of 161235636229 in words is "one hundred sixty-one billion, two hundred thirty-five million, six hundred thirty-six thousand, two hundred twenty-nine".