205400253311 has 8 divisors (see below), whose sum is σ = 229284004224. Its totient is φ = 182385002520.

The previous prime is 205400253299. The next prime is 205400253319. The reversal of 205400253311 is 113352004502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205400253311 - 2¹⁰ = 205400252287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205400253319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217124531 + ... + 217125476.

It is an arithmetic number, because the mean of its divisors is an integer number (28660500528).

Almost surely, 2^205400253311 is an apocalyptic number.

205400253311 is a deficient number, since it is larger than the sum of its proper divisors (23883750913).

205400253311 is a wasteful number, since it uses less digits than its factorization.

205400253311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434250061.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 205400253311 its reverse (113352004502), we get a palindrome (318752257813).

The spelling of 205400253311 in words is "two hundred five billion, four hundred million, two hundred fifty-three thousand, three hundred eleven".