206166025103161 has 2 divisors, whose sum is σ = 206166025103162. Its totient is φ = 206166025103160.

The previous prime is 206166025103123. The next prime is 206166025103197. The reversal of 206166025103161 is 161301520661602.

It is a happy number.

206166025103161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188486649153936 + 17679375949225 = 13729044^2 + 4204685^2 .

It is a cyclic number.

It is not a de Polignac number, because 206166025103161 - 2¹⁹ = 206166024578873 is a prime.

It is not a weakly prime, because it can be changed into another prime (206166025103261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103083012551580 + 103083012551581.

It is an arithmetic number, because the mean of its divisors is an integer number (103083012551581).

Almost surely, 2^{206166025103161} is an apocalyptic number.

It is an amenable number.

206166025103161 is a deficient number, since it is larger than the sum of its proper divisors (1).

206166025103161 is an equidigital number, since it uses as much as digits as its factorization.

206166025103161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 40.

Adding to 206166025103161 its reverse (161301520661602), we get a palindrome (367467545764763).

The spelling of 206166025103161 in words is "two hundred six trillion, one hundred sixty-six billion, twenty-five million, one hundred three thousand, one hundred sixty-one".