205385205387 has 16 divisors (see below), whose sum is σ = 275494770720. Its totient is φ = 136099928832.

The previous prime is 205385205379. The next prime is 205385205451. The reversal of 205385205387 is 783502583502.

It is not a de Polignac number, because 205385205387 - 2³ = 205385205379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205385205187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2268789 + ... + 2357577.

It is an arithmetic number, because the mean of its divisors is an integer number (17218423170).

Almost surely, 2^205385205387 is an apocalyptic number.

205385205387 is a deficient number, since it is larger than the sum of its proper divisors (70109565333).

205385205387 is a wasteful number, since it uses less digits than its factorization.

205385205387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93422.

The product of its (nonzero) digits is 2016000, while the sum is 48.

Adding to 205385205387 its reverse (783502583502), we get a palindrome (988887788889).

The spelling of 205385205387 in words is "two hundred five billion, three hundred eighty-five million, two hundred five thousand, three hundred eighty-seven".