205666411 has 2 divisors, whose sum is σ = 205666412. Its totient is φ = 205666410.

The previous prime is 205666367. The next prime is 205666421. The reversal of 205666411 is 114666502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205666411 - 2⁷ = 205666283 is a prime.

It is a super-2 number, since 2×205666411² = 84597345227241842, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205666421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102833205 + 102833206.

It is an arithmetic number, because the mean of its divisors is an integer number (102833206).

Almost surely, 2^205666411 is an apocalyptic number.

205666411 is a deficient number, since it is larger than the sum of its proper divisors (1).

205666411 is an equidigital number, since it uses as much as digits as its factorization.

205666411 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 205666411 is about 14341.0742624114. The cubic root of 205666411 is about 590.2750905246.

Subtracting from 205666411 its reverse (114666502), we obtain a palindrome (90999909).

The spelling of 205666411 in words is "two hundred five million, six hundred sixty-six thousand, four hundred eleven".