206505515191 has 2 divisors, whose sum is σ = 206505515192. Its totient is φ = 206505515190.

The previous prime is 206505515179. The next prime is 206505515219. The reversal of 206505515191 is 191515505602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 206505515191 - 2⁵ = 206505515159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206505585191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103252757595 + 103252757596.

It is an arithmetic number, because the mean of its divisors is an integer number (103252757596).

Almost surely, 2^206505515191 is an apocalyptic number.

206505515191 is a deficient number, since it is larger than the sum of its proper divisors (1).

206505515191 is an equidigital number, since it uses as much as digits as its factorization.

206505515191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67500, while the sum is 40.

The spelling of 206505515191 in words is "two hundred six billion, five hundred five million, five hundred fifteen thousand, one hundred ninety-one".