205122201609 has 16 divisors (see below), whose sum is σ = 294892368512. Its totient is φ = 126075650688.

The previous prime is 205122201601. The next prime is 205122201611. The reversal of 205122201609 is 906102221502.

It is not a de Polignac number, because 205122201609 - 2³ = 205122201601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205122201601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3163252 + ... + 3227445.

It is an arithmetic number, because the mean of its divisors is an integer number (18430773032).

Almost surely, 2^205122201609 is an apocalyptic number.

It is an amenable number.

205122201609 is a deficient number, since it is larger than the sum of its proper divisors (89770166903).

205122201609 is a wasteful number, since it uses less digits than its factorization.

205122201609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6391536.

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 205122201609 in words is "two hundred five billion, one hundred twenty-two million, two hundred one thousand, six hundred nine".