206505585191 has 2 divisors, whose sum is σ = 206505585192. Its totient is φ = 206505585190.

The previous prime is 206505585179. The next prime is 206505585193. The reversal of 206505585191 is 191585505602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206505585191 - 2²⁶ = 206438476327 is a prime.

Together with 206505585193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206505585193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103252792595 + 103252792596.

It is an arithmetic number, because the mean of its divisors is an integer number (103252792596).

Almost surely, 2^206505585191 is an apocalyptic number.

206505585191 is a deficient number, since it is larger than the sum of its proper divisors (1).

206505585191 is an equidigital number, since it uses as much as digits as its factorization.

206505585191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540000, while the sum is 47.

The spelling of 206505585191 in words is "two hundred six billion, five hundred five million, five hundred eighty-five thousand, one hundred ninety-one".