243123353512 has 64 divisors (see below), whose sum is σ = 520067520000. Its totient is φ = 105555778560.

The previous prime is 243123353509. The next prime is 243123353519. The reversal of 243123353512 is 215353321342.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (243123353519) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3499837 + ... + 3568627.

It is an arithmetic number, because the mean of its divisors is an integer number (8126055000).

Almost surely, 2^243123353512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243123353512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260033760000).

243123353512 is an abundant number, since it is smaller than the sum of its proper divisors (276944166488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243123353512 is a wasteful number, since it uses less digits than its factorization.

243123353512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70826 (or 70822 counting only the distinct ones).

The product of its digits is 64800, while the sum is 34.

Adding to 243123353512 its reverse (215353321342), we get a palindrome (458476674854).

The spelling of 243123353512 in words is "two hundred forty-three billion, one hundred twenty-three million, three hundred fifty-three thousand, five hundred twelve".