204243404342423 has 2 divisors, whose sum is σ = 204243404342424. Its totient is φ = 204243404342422.

The previous prime is 204243404342399. The next prime is 204243404342443. The reversal of 204243404342423 is 324243404342402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204243404342423 - 2¹⁸ = 204243404080279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204243404342443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102121702171211 + 102121702171212.

It is an arithmetic number, because the mean of its divisors is an integer number (102121702171212).

Almost surely, 2^{204243404342423} is an apocalyptic number.

204243404342423 is a deficient number, since it is larger than the sum of its proper divisors (1).

204243404342423 is an equidigital number, since it uses as much as digits as its factorization.

204243404342423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1769472, while the sum is 41.

Adding to 204243404342423 its reverse (324243404342402), we get a palindrome (528486808684825).

The spelling of 204243404342423 in words is "two hundred four trillion, two hundred forty-three billion, four hundred four million, three hundred forty-two thousand, four hundred twenty-three".