243945605109 has 8 divisors (see below), whose sum is σ = 344393795520. Its totient is φ = 153063909056.

The previous prime is 243945605089. The next prime is 243945605147. The reversal of 243945605109 is 901506549342.

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

It is a cyclic number.

It is not a de Polignac number, because 243945605109 - 2⁸ = 243945604853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243945605179) 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, 2391623529 + ... + 2391623630.

It is an arithmetic number, because the mean of its divisors is an integer number (43049224440).

Almost surely, 2^243945605109 is an apocalyptic number.

It is an amenable number.

243945605109 is a deficient number, since it is larger than the sum of its proper divisors (100448190411).

243945605109 is a wasteful number, since it uses less digits than its factorization.

243945605109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4783247179.

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 243945605109 in words is "two hundred forty-three billion, nine hundred forty-five million, six hundred five thousand, one hundred nine".