206013256081 has 2 divisors, whose sum is σ = 206013256082. Its totient is φ = 206013256080.

The previous prime is 206013256027. The next prime is 206013256087. The reversal of 206013256081 is 180652310602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141391040400 + 64622215681 = 376020^2 + 254209^2 .

It is a cyclic number.

It is not a de Polignac number, because 206013256081 - 2²¹ = 206011158929 is a prime.

It is a super-2 number, since 2×206013256081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (206013256087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103006628040 + 103006628041.

It is an arithmetic number, because the mean of its divisors is an integer number (103006628041).

Almost surely, 2^206013256081 is an apocalyptic number.

It is an amenable number.

206013256081 is a deficient number, since it is larger than the sum of its proper divisors (1).

206013256081 is an equidigital number, since it uses as much as digits as its factorization.

206013256081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 34.

Adding to 206013256081 its reverse (180652310602), we get a palindrome (386665566683).

The spelling of 206013256081 in words is "two hundred six billion, thirteen million, two hundred fifty-six thousand, eighty-one".