243521640436 has 24 divisors (see below), whose sum is σ = 448651899360. Its totient is φ = 115337080800.

The previous prime is 243521640391. The next prime is 243521640457. The reversal of 243521640436 is 634046125342.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376206 + ... + 792826.

It is an arithmetic number, because the mean of its divisors is an integer number (18693829140).

Almost surely, 2^243521640436 is an apocalyptic number.

It is an amenable number.

243521640436 is a deficient number, since it is larger than the sum of its proper divisors (205130258924).

243521640436 is a wasteful number, since it uses less digits than its factorization.

243521640436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424335 (or 424333 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 40.

Adding to 243521640436 its reverse (634046125342), we get a palindrome (877567765778).

The spelling of 243521640436 in words is "two hundred forty-three billion, five hundred twenty-one million, six hundred forty thousand, four hundred thirty-six".