205243011453 has 4 divisors (see below), whose sum is σ = 273657348608. Its totient is φ = 136828674300.

The previous prime is 205243011433. The next prime is 205243011499. The reversal of 205243011453 is 354110342502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 205243011453 - 2⁹ = 205243010941 is a prime.

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 205243011453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205243011403) 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, 34207168573 + ... + 34207168578.

It is an arithmetic number, because the mean of its divisors is an integer number (68414337152).

Almost surely, 2^205243011453 is an apocalyptic number.

It is an amenable number.

205243011453 is a deficient number, since it is larger than the sum of its proper divisors (68414337155).

205243011453 is an equidigital number, since it uses as much as digits as its factorization.

205243011453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68414337154.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 205243011453 its reverse (354110342502), we get a palindrome (559353353955).

The spelling of 205243011453 in words is "two hundred five billion, two hundred forty-three million, eleven thousand, four hundred fifty-three".