243636121698 has 16 divisors (see below), whose sum is σ = 487418042496. Its totient is φ = 81187740720.

The previous prime is 243636121607. The next prime is 243636121709. The reversal of 243636121698 is 896121636342.

It is a self number, because there is not a number n which added to its sum of digits gives 243636121698.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6053233 + ... + 6093348.

It is an arithmetic number, because the mean of its divisors is an integer number (30463627656).

Almost surely, 2^243636121698 is an apocalyptic number.

243636121698 is an abundant number, since it is smaller than the sum of its proper divisors (243781920798).

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

243636121698 is a wasteful number, since it uses less digits than its factorization.

243636121698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12149929.

The product of its digits is 2239488, while the sum is 51.

The spelling of 243636121698 in words is "two hundred forty-three billion, six hundred thirty-six million, one hundred twenty-one thousand, six hundred ninety-eight".