206505060061 has 2 divisors, whose sum is σ = 206505060062. Its totient is φ = 206505060060.

The previous prime is 206505060059. The next prime is 206505060071. The reversal of 206505060061 is 160060505602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127470420900 + 79034639161 = 357030^2 + 281131^2 .

It is a cyclic number.

It is not a de Polignac number, because 206505060061 - 2¹ = 206505060059 is a prime.

Together with 206505060059, 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 (206505060001) by changing a digit.

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, 103252530030 + 103252530031.

It is an arithmetic number, because the mean of its divisors is an integer number (103252530031).

Almost surely, 2^206505060061 is an apocalyptic number.

It is an amenable number.

206505060061 is a deficient number, since it is larger than the sum of its proper divisors (1).

206505060061 is an equidigital number, since it uses as much as digits as its factorization.

206505060061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 31.

Adding to 206505060061 its reverse (160060505602), we get a palindrome (366565565663).

The spelling of 206505060061 in words is "two hundred six billion, five hundred five million, sixty thousand, sixty-one".