204023312261 has 2 divisors, whose sum is σ = 204023312262. Its totient is φ = 204023312260.

The previous prime is 204023312149. The next prime is 204023312393. The reversal of 204023312261 is 162213320402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151344340900 + 52678971361 = 389030^2 + 229519^2 .

It is a cyclic number.

It is not a de Polignac number, because 204023312261 - 2¹⁴ = 204023295877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204023312261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204023312461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102011656130 + 102011656131.

It is an arithmetic number, because the mean of its divisors is an integer number (102011656131).

Almost surely, 2^204023312261 is an apocalyptic number.

It is an amenable number.

204023312261 is a deficient number, since it is larger than the sum of its proper divisors (1).

204023312261 is an equidigital number, since it uses as much as digits as its factorization.

204023312261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 204023312261 its reverse (162213320402), we get a palindrome (366236632663).

The spelling of 204023312261 in words is "two hundred four billion, twenty-three million, three hundred twelve thousand, two hundred sixty-one".