205585693091 has 2 divisors, whose sum is σ = 205585693092. Its totient is φ = 205585693090.

The previous prime is 205585693051. The next prime is 205585693211. The reversal of 205585693091 is 190396585502.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205585693091 is a prime.

It is not a weakly prime, because it can be changed into another prime (205585693021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102792846545 + 102792846546.

It is an arithmetic number, because the mean of its divisors is an integer number (102792846546).

Almost surely, 2^205585693091 is an apocalyptic number.

205585693091 is a deficient number, since it is larger than the sum of its proper divisors (1).

205585693091 is an equidigital number, since it uses as much as digits as its factorization.

205585693091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916000, while the sum is 53.

The spelling of 205585693091 in words is "two hundred five billion, five hundred eighty-five million, six hundred ninety-three thousand, ninety-one".