204242252569 has 2 divisors, whose sum is σ = 204242252570. Its totient is φ = 204242252568.

The previous prime is 204242252507. The next prime is 204242252581. The reversal of 204242252569 is 965252242402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201701588544 + 2540664025 = 449112^2 + 50405^2 .

It is a cyclic number.

It is not a de Polignac number, because 204242252569 - 2¹⁹ = 204241728281 is a prime.

It is a super-2 number, since 2×204242252569² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (204242259569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102121126284 + 102121126285.

It is an arithmetic number, because the mean of its divisors is an integer number (102121126285).

Almost surely, 2^204242252569 is an apocalyptic number.

It is an amenable number.

204242252569 is a deficient number, since it is larger than the sum of its proper divisors (1).

204242252569 is an equidigital number, since it uses as much as digits as its factorization.

204242252569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 691200, while the sum is 43.

The spelling of 204242252569 in words is "two hundred four billion, two hundred forty-two million, two hundred fifty-two thousand, five hundred sixty-nine".