243203355545 has 8 divisors (see below), whose sum is σ = 301907613960. Its totient is φ = 187853626240.

The previous prime is 243203355541. The next prime is 243203355547. The reversal of 243203355545 is 545553302342.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 48454135129 + 194749220416 = 220123^2 + 441304^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 243203355545 - 2² = 243203355541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243203355541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 838632116 + ... + 838632405.

It is an arithmetic number, because the mean of its divisors is an integer number (37738451745).

Almost surely, 2^243203355545 is an apocalyptic number.

It is an amenable number.

243203355545 is a deficient number, since it is larger than the sum of its proper divisors (58704258415).

243203355545 is a wasteful number, since it uses less digits than its factorization.

243203355545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1677264555.

The product of its (nonzero) digits is 1080000, while the sum is 41.

Adding to 243203355545 its reverse (545553302342), we get a palindrome (788756657887).

The spelling of 243203355545 in words is "two hundred forty-three billion, two hundred three million, three hundred fifty-five thousand, five hundred forty-five".