206595681181 has 2 divisors, whose sum is σ = 206595681182. Its totient is φ = 206595681180.

The previous prime is 206595681179. The next prime is 206595681211. The reversal of 206595681181 is 181186595602.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175448725956 + 31146955225 = 418866^2 + 176485^2 .

It is a cyclic number.

It is not a de Polignac number, because 206595681181 - 2¹ = 206595681179 is a prime.

It is a super-2 number, since 2×206595681181² (a number of 23 digits) contains 22 as substring.

Together with 206595681179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206595681101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103297840590 + 103297840591.

It is an arithmetic number, because the mean of its divisors is an integer number (103297840591).

Almost surely, 2^206595681181 is an apocalyptic number.

It is an amenable number.

206595681181 is a deficient number, since it is larger than the sum of its proper divisors (1).

206595681181 is an equidigital number, since it uses as much as digits as its factorization.

206595681181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1036800, while the sum is 52.

The spelling of 206595681181 in words is "two hundred six billion, five hundred ninety-five million, six hundred eighty-one thousand, one hundred eighty-one".