205204035173 has 2 divisors, whose sum is σ = 205204035174. Its totient is φ = 205204035172.

The previous prime is 205204035151. The next prime is 205204035181. The reversal of 205204035173 is 371530402502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173440597444 + 31763437729 = 416462^2 + 178223^2 .

It is a cyclic number.

It is not a de Polignac number, because 205204035173 - 2²⁸ = 204935599717 is a prime.

It is a super-2 number, since 2×205204035173² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205204034173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102602017586 + 102602017587.

It is an arithmetic number, because the mean of its divisors is an integer number (102602017587).

Almost surely, 2^205204035173 is an apocalyptic number.

It is an amenable number.

205204035173 is a deficient number, since it is larger than the sum of its proper divisors (1).

205204035173 is an equidigital number, since it uses as much as digits as its factorization.

205204035173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 32.

Adding to 205204035173 its reverse (371530402502), we get a palindrome (576734437675).

The spelling of 205204035173 in words is "two hundred five billion, two hundred four million, thirty-five thousand, one hundred seventy-three".