205447320719 has 2 divisors, whose sum is σ = 205447320720. Its totient is φ = 205447320718.

The previous prime is 205447320703. The next prime is 205447320751. The reversal of 205447320719 is 917023744502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205447320719 - 2⁴ = 205447320703 is a prime.

It is a super-2 number, since 2×205447320719² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 205447320719.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205447320019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102723660359 + 102723660360.

It is an arithmetic number, because the mean of its divisors is an integer number (102723660360).

Almost surely, 2^205447320719 is an apocalyptic number.

205447320719 is a deficient number, since it is larger than the sum of its proper divisors (1).

205447320719 is an equidigital number, since it uses as much as digits as its factorization.

205447320719 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 44.

The spelling of 205447320719 in words is "two hundred five billion, four hundred forty-seven million, three hundred twenty thousand, seven hundred nineteen".