203240534545 has 4 divisors (see below), whose sum is σ = 243888641460. Its totient is φ = 162592427632.

The previous prime is 203240534509. The next prime is 203240534591. The reversal of 203240534545 is 545435042302.

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 102850414209 + 100390120336 = 320703^2 + 316844^2 .

It is a cyclic number.

It is not a de Polignac number, because 203240534545 - 2¹³ = 203240526353 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20324053450 + ... + 20324053459.

It is an arithmetic number, because the mean of its divisors is an integer number (60972160365).

Almost surely, 2^203240534545 is an apocalyptic number.

It is an amenable number.

203240534545 is a deficient number, since it is larger than the sum of its proper divisors (40648106915).

203240534545 is an equidigital number, since it uses as much as digits as its factorization.

203240534545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40648106914.

The product of its (nonzero) digits is 288000, while the sum is 37.

Adding to 203240534545 its reverse (545435042302), we get a palindrome (748675576847).

The spelling of 203240534545 in words is "two hundred three billion, two hundred forty million, five hundred thirty-four thousand, five hundred forty-five".