205553544231 has 16 divisors (see below), whose sum is σ = 313348775168. Its totient is φ = 117412545600.

The previous prime is 205553544187. The next prime is 205553544247. The reversal of 205553544231 is 132445355502.

It is not a de Polignac number, because 205553544231 - 2¹⁷ = 205553413159 is a prime.

It is a super-2 number, since 2×205553544231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205553544231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205553544331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1888405 + ... + 1994286.

It is an arithmetic number, because the mean of its divisors is an integer number (19584298448).

Almost surely, 2^205553544231 is an apocalyptic number.

205553544231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

205553544231 is a deficient number, since it is larger than the sum of its proper divisors (107795230937).

205553544231 is a wasteful number, since it uses less digits than its factorization.

205553544231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3885222.

The product of its (nonzero) digits is 360000, while the sum is 39.

Adding to 205553544231 its reverse (132445355502), we get a palindrome (337998899733).

The spelling of 205553544231 in words is "two hundred five billion, five hundred fifty-three million, five hundred forty-four thousand, two hundred thirty-one".