243545699838 has 64 divisors (see below), whose sum is σ = 575053516800. Its totient is φ = 67290566400.

The previous prime is 243545699827. The next prime is 243545699899. The reversal of 243545699838 is 838996545342.

243545699838 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×243545699838³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1730338 + ... + 1865786.

It is an arithmetic number, because the mean of its divisors is an integer number (8985211200).

Almost surely, 2^243545699838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243545699838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287526758400).

243545699838 is an abundant number, since it is smaller than the sum of its proper divisors (331507816962).

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

243545699838 is a wasteful number, since it uses less digits than its factorization.

243545699838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136873.

The product of its digits is 223948800, while the sum is 66.

The spelling of 243545699838 in words is "two hundred forty-three billion, five hundred forty-five million, six hundred ninety-nine thousand, eight hundred thirty-eight".