206411630561 has 2 divisors, whose sum is σ = 206411630562. Its totient is φ = 206411630560.

The previous prime is 206411630459. The next prime is 206411630563. The reversal of 206411630561 is 165036114602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130100883025 + 76310747536 = 360695^2 + 276244^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206411630561 is a prime.

It is a super-2 number, since 2×206411630561² (a number of 23 digits) contains 22 as substring.

Together with 206411630563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (206411630563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103205815280 + 103205815281.

It is an arithmetic number, because the mean of its divisors is an integer number (103205815281).

Almost surely, 2^206411630561 is an apocalyptic number.

It is an amenable number.

206411630561 is a deficient number, since it is larger than the sum of its proper divisors (1).

206411630561 is an equidigital number, since it uses as much as digits as its factorization.

206411630561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 206411630561 in words is "two hundred six billion, four hundred eleven million, six hundred thirty thousand, five hundred sixty-one".