81126000161 has 2 divisors, whose sum is σ = 81126000162. Its totient is φ = 81126000160.

The previous prime is 81126000133. The next prime is 81126000199. The reversal of 81126000161 is 16100062118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75265179025 + 5860821136 = 274345^2 + 76556^2 .

It is a cyclic number.

It is not a de Polignac number, because 81126000161 - 2²⁶ = 81058891297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81126000161.

It is a weakly prime.

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, 40563000080 + 40563000081.

It is an arithmetic number, because the mean of its divisors is an integer number (40563000081).

Almost surely, 2^81126000161 is an apocalyptic number.

It is an amenable number.

81126000161 is a deficient number, since it is larger than the sum of its proper divisors (1).

81126000161 is an equidigital number, since it uses as much as digits as its factorization.

81126000161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 26.

Adding to 81126000161 its reverse (16100062118), we get a palindrome (97226062279).

The spelling of 81126000161 in words is "eighty-one billion, one hundred twenty-six million, one hundred sixty-one", and thus it is an aban number.