204434340161 has 2 divisors, whose sum is σ = 204434340162. Its totient is φ = 204434340160.

The previous prime is 204434340139. The next prime is 204434340163. The reversal of 204434340161 is 161043434402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115365519025 + 89068821136 = 339655^2 + 298444^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204434340161 is a prime.

Together with 204434340163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (204434340163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102217170080 + 102217170081.

It is an arithmetic number, because the mean of its divisors is an integer number (102217170081).

Almost surely, 2^204434340161 is an apocalyptic number.

It is an amenable number.

204434340161 is a deficient number, since it is larger than the sum of its proper divisors (1).

204434340161 is an equidigital number, since it uses as much as digits as its factorization.

204434340161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 204434340161 its reverse (161043434402), we get a palindrome (365477774563).

The spelling of 204434340161 in words is "two hundred four billion, four hundred thirty-four million, three hundred forty thousand, one hundred sixty-one".