204553111261 has 2 divisors, whose sum is σ = 204553111262. Its totient is φ = 204553111260.

The previous prime is 204553111223. The next prime is 204553111319. The reversal of 204553111261 is 162111355402.

204553111261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179780240025 + 24772871236 = 424005^2 + 157394^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204553111261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204553111661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102276555630 + 102276555631.

It is an arithmetic number, because the mean of its divisors is an integer number (102276555631).

Almost surely, 2^204553111261 is an apocalyptic number.

It is an amenable number.

204553111261 is a deficient number, since it is larger than the sum of its proper divisors (1).

204553111261 is an equidigital number, since it uses as much as digits as its factorization.

204553111261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 31.

Adding to 204553111261 its reverse (162111355402), we get a palindrome (366664466663).

The spelling of 204553111261 in words is "two hundred four billion, five hundred fifty-three million, one hundred eleven thousand, two hundred sixty-one".