205348774991 has 2 divisors, whose sum is σ = 205348774992. Its totient is φ = 205348774990.

The previous prime is 205348774979. The next prime is 205348775029. The reversal of 205348774991 is 199477843502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205348774991 - 2¹⁸ = 205348512847 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205348774991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205348774691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102674387495 + 102674387496.

It is an arithmetic number, because the mean of its divisors is an integer number (102674387496).

Almost surely, 2^205348774991 is an apocalyptic number.

205348774991 is a deficient number, since it is larger than the sum of its proper divisors (1).

205348774991 is an equidigital number, since it uses as much as digits as its factorization.

205348774991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15240960, while the sum is 59.

The spelling of 205348774991 in words is "two hundred five billion, three hundred forty-eight million, seven hundred seventy-four thousand, nine hundred ninety-one".