205551413311 has 4 divisors (see below), whose sum is σ = 211106856952. Its totient is φ = 199995969672.

The previous prime is 205551413293. The next prime is 205551413339. The reversal of 205551413311 is 113314155502.

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 205551413311 - 2⁵ = 205551413279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205551413371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2777721765 + ... + 2777721838.

It is an arithmetic number, because the mean of its divisors is an integer number (52776714238).

Almost surely, 2^205551413311 is an apocalyptic number.

205551413311 is a deficient number, since it is larger than the sum of its proper divisors (5555443641).

205551413311 is an equidigital number, since it uses as much as digits as its factorization.

205551413311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5555443640.

The product of its (nonzero) digits is 9000, while the sum is 31.

Adding to 205551413311 its reverse (113314155502), we get a palindrome (318865568813).

The spelling of 205551413311 in words is "two hundred five billion, five hundred fifty-one million, four hundred thirteen thousand, three hundred eleven".