243042555545 has 8 divisors (see below), whose sum is σ = 291653999880. Its totient is φ = 194432088960.

The previous prime is 243042555523. The next prime is 243042555593. The reversal of 243042555545 is 545555240342.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15669030976 + 227373524569 = 125176^2 + 476837^2 .

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

It is not a de Polignac number, because 243042555545 - 2⁸ = 243042555289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243042555496 and 243042555505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519455 + ... + 869435.

It is an arithmetic number, because the mean of its divisors is an integer number (36456749985).

Almost surely, 2^243042555545 is an apocalyptic number.

It is an amenable number.

243042555545 is a deficient number, since it is larger than the sum of its proper divisors (48611444335).

243042555545 is a wasteful number, since it uses less digits than its factorization.

243042555545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488875.

The product of its (nonzero) digits is 2400000, while the sum is 44.

Adding to 243042555545 its reverse (545555240342), we get a palindrome (788597795887).

The spelling of 243042555545 in words is "two hundred forty-three billion, forty-two million, five hundred fifty-five thousand, five hundred forty-five".