204243154523 has 2 divisors, whose sum is σ = 204243154524. Its totient is φ = 204243154522.

The previous prime is 204243154517. The next prime is 204243154541. The reversal of 204243154523 is 325451342402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 204243154523 - 2⁸ = 204243154267 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (204243154823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102121577261 + 102121577262.

It is an arithmetic number, because the mean of its divisors is an integer number (102121577262).

Almost surely, 2^204243154523 is an apocalyptic number.

204243154523 is a deficient number, since it is larger than the sum of its proper divisors (1).

204243154523 is an equidigital number, since it uses as much as digits as its factorization.

204243154523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 115200, while the sum is 35.

Adding to 204243154523 its reverse (325451342402), we get a palindrome (529694496925).

The spelling of 204243154523 in words is "two hundred four billion, two hundred forty-three million, one hundred fifty-four thousand, five hundred twenty-three".