243450205253 has 4 divisors (see below), whose sum is σ = 257770805580. Its totient is φ = 229129604928.

The previous prime is 243450205199. The next prime is 243450205261. The reversal of 243450205253 is 352502054342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 167741031844 + 75709173409 = 409562^2 + 275153^2 .

It is a cyclic number.

It is not a de Polignac number, because 243450205253 - 2²² = 243446010949 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 (243450225253) 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, 7160300138 + ... + 7160300171.

It is an arithmetic number, because the mean of its divisors is an integer number (64442701395).

Almost surely, 2^243450205253 is an apocalyptic number.

It is an amenable number.

243450205253 is a deficient number, since it is larger than the sum of its proper divisors (14320600327).

243450205253 is a wasteful number, since it uses less digits than its factorization.

243450205253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14320600326.

The product of its (nonzero) digits is 144000, while the sum is 35.

Adding to 243450205253 its reverse (352502054342), we get a palindrome (595952259595).

The spelling of 243450205253 in words is "two hundred forty-three billion, four hundred fifty million, two hundred five thousand, two hundred fifty-three".