205447320791 has 2 divisors, whose sum is σ = 205447320792. Its totient is φ = 205447320790.

The previous prime is 205447320787. The next prime is 205447320821. The reversal of 205447320791 is 197023744502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205447320791 - 2² = 205447320787 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205447320751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102723660395 + 102723660396.

It is an arithmetic number, because the mean of its divisors is an integer number (102723660396).

Almost surely, 2^205447320791 is an apocalyptic number.

205447320791 is a deficient number, since it is larger than the sum of its proper divisors (1).

205447320791 is an equidigital number, since it uses as much as digits as its factorization.

205447320791 is an evil number, because the sum of its binary digits is even.

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

The spelling of 205447320791 in words is "two hundred five billion, four hundred forty-seven million, three hundred twenty thousand, seven hundred ninety-one".