204155521289729 has 2 divisors, whose sum is σ = 204155521289730. Its totient is φ = 204155521289728.

The previous prime is 204155521289723. The next prime is 204155521289747. The reversal of 204155521289729 is 927982125551402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168068588872129 + 36086932417600 = 12964127^2 + 6007240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204155521289729 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (204155521289723) 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, 102077760644864 + 102077760644865.

It is an arithmetic number, because the mean of its divisors is an integer number (102077760644865).

Almost surely, 2^{204155521289729} is an apocalyptic number.

It is an amenable number.

204155521289729 is a deficient number, since it is larger than the sum of its proper divisors (1).

204155521289729 is an equidigital number, since it uses as much as digits as its factorization.

204155521289729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288000, while the sum is 62.

The spelling of 204155521289729 in words is "two hundred four trillion, one hundred fifty-five billion, five hundred twenty-one million, two hundred eighty-nine thousand, seven hundred twenty-nine".