181886620366049 has 2 divisors, whose sum is σ = 181886620366050. Its totient is φ = 181886620366048.

The previous prime is 181886620366037. The next prime is 181886620366091. The reversal of 181886620366049 is 940663026688181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179955034631824 + 1931585734225 = 13414732^2 + 1389815^2 .

It is a cyclic number.

It is not a de Polignac number, because 181886620366049 - 2²⁸ = 181886351930593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 181886620366049.

It is not a weakly prime, because it can be changed into another prime (181886620366249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90943310183024 + 90943310183025.

It is an arithmetic number, because the mean of its divisors is an integer number (90943310183025).

Almost surely, 2^{181886620366049} is an apocalyptic number.

It is an amenable number.

181886620366049 is a deficient number, since it is larger than the sum of its proper divisors (1).

181886620366049 is an equidigital number, since it uses as much as digits as its factorization.

181886620366049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 143327232, while the sum is 68.

The spelling of 181886620366049 in words is "one hundred eighty-one trillion, eight hundred eighty-six billion, six hundred twenty million, three hundred sixty-six thousand, forty-nine".