243163121634 has 64 divisors (see below), whose sum is σ = 547397136000. Its totient is φ = 80002391040.

The previous prime is 243163121603. The next prime is 243163121647. The reversal of 243163121634 is 436121361342.

243163121634 is a `hidden beast` number, since 2 + 4 + 3 + 1 + 6 + 3 + 12 + 1 + 634 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2699922 + ... + 2788530.

It is an arithmetic number, because the mean of its divisors is an integer number (8553080250).

Almost surely, 2^243163121634 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243163121634, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273698568000).

243163121634 is an abundant number, since it is smaller than the sum of its proper divisors (304234014366).

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

243163121634 is a wasteful number, since it uses less digits than its factorization.

243163121634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89280 (or 89274 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

Adding to 243163121634 its reverse (436121361342), we get a palindrome (679284482976).

The spelling of 243163121634 in words is "two hundred forty-three billion, one hundred sixty-three million, one hundred twenty-one thousand, six hundred thirty-four".