205042042435 has 4 divisors (see below), whose sum is σ = 246050450928. Its totient is φ = 164033633944.

The previous prime is 205042042411. The next prime is 205042042441. The reversal of 205042042435 is 534240240502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205042042435 - 2¹⁷ = 205041911363 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205042042397 and 205042042406.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20504204239 + ... + 20504204248.

It is an arithmetic number, because the mean of its divisors is an integer number (61512612732).

Almost surely, 2^205042042435 is an apocalyptic number.

205042042435 is a deficient number, since it is larger than the sum of its proper divisors (41008408493).

205042042435 is an equidigital number, since it uses as much as digits as its factorization.

205042042435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41008408492.

The product of its (nonzero) digits is 38400, while the sum is 31.

Adding to 205042042435 its reverse (534240240502), we get a palindrome (739282282937).

The spelling of 205042042435 in words is "two hundred five billion, forty-two million, forty-two thousand, four hundred thirty-five".