205123142105 has 16 divisors (see below), whose sum is σ = 282540184320. Its totient is φ = 140041645632.

The previous prime is 205123142087. The next prime is 205123142129. The reversal of 205123142105 is 501241321502.

205123142105 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 205123142105 - 2⁶ = 205123142041 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12788189 + ... + 12804218.

It is an arithmetic number, because the mean of its divisors is an integer number (17658761520).

Almost surely, 2^205123142105 is an apocalyptic number.

It is an amenable number.

205123142105 is a deficient number, since it is larger than the sum of its proper divisors (77417042215).

205123142105 is a wasteful number, since it uses less digits than its factorization.

205123142105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25592648.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 205123142105 its reverse (501241321502), we get a palindrome (706364463607).

The spelling of 205123142105 in words is "two hundred five billion, one hundred twenty-three million, one hundred forty-two thousand, one hundred five".