206006022181 has 2 divisors, whose sum is σ = 206006022182. Its totient is φ = 206006022180.

The previous prime is 206006022163. The next prime is 206006022203. The reversal of 206006022181 is 181220600602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147340822500 + 58665199681 = 383850^2 + 242209^2 .

It is a cyclic number.

It is not a de Polignac number, because 206006022181 - 2⁵ = 206006022149 is a prime.

It is a super-2 number, since 2×206006022181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206006022881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103003011090 + 103003011091.

It is an arithmetic number, because the mean of its divisors is an integer number (103003011091).

Almost surely, 2^206006022181 is an apocalyptic number.

It is an amenable number.

206006022181 is a deficient number, since it is larger than the sum of its proper divisors (1).

206006022181 is an equidigital number, since it uses as much as digits as its factorization.

206006022181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

Adding to 206006022181 its reverse (181220600602), we get a palindrome (387226622783).

The spelling of 206006022181 in words is "two hundred six billion, six million, twenty-two thousand, one hundred eighty-one".