205442002225609 has 2 divisors, whose sum is σ = 205442002225610. Its totient is φ = 205442002225608.

The previous prime is 205442002225601. The next prime is 205442002225633. The reversal of 205442002225609 is 906522200244502.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201246993684025 + 4195008541584 = 14186155^2 + 2048172^2 .

It is a cyclic number.

It is not a de Polignac number, because 205442002225609 - 2³ = 205442002225601 is a prime.

It is not a weakly prime, because it can be changed into another prime (205442002225601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102721001112804 + 102721001112805.

It is an arithmetic number, because the mean of its divisors is an integer number (102721001112805).

Almost surely, 2^{205442002225609} is an apocalyptic number.

It is an amenable number.

205442002225609 is a deficient number, since it is larger than the sum of its proper divisors (1).

205442002225609 is an equidigital number, since it uses as much as digits as its factorization.

205442002225609 is an evil number, because the sum of its binary digits is even.

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

The spelling of 205442002225609 in words is "two hundred five trillion, four hundred forty-two billion, two million, two hundred twenty-five thousand, six hundred nine".