205042405135 has 16 divisors (see below), whose sum is σ = 249754629600. Its totient is φ = 161565376896.

The previous prime is 205042405063. The next prime is 205042405151. The reversal of 205042405135 is 531504240502.

It is a cyclic number.

It is not a de Polignac number, because 205042405135 - 2²³ = 205034016527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205042405097 and 205042405106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2990821 + ... + 3058609.

It is an arithmetic number, because the mean of its divisors is an integer number (15609664350).

Almost surely, 2^205042405135 is an apocalyptic number.

205042405135 is a deficient number, since it is larger than the sum of its proper divisors (44712224465).

205042405135 is an equidigital number, since it uses as much as digits as its factorization.

205042405135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76890.

The product of its (nonzero) digits is 24000, while the sum is 31.

Adding to 205042405135 its reverse (531504240502), we get a palindrome (736546645637).

The spelling of 205042405135 in words is "two hundred five billion, forty-two million, four hundred five thousand, one hundred thirty-five".