243664645321 has 8 divisors (see below), whose sum is σ = 255257596800. Its totient is φ = 232284408720.

The previous prime is 243664645313. The next prime is 243664645351. The reversal of 243664645321 is 123546466342.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243664645321 - 2³ = 243664645313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243664645351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53176375 + ... + 53180956.

It is an arithmetic number, because the mean of its divisors is an integer number (31907199600).

Almost surely, 2^243664645321 is an apocalyptic number.

It is an amenable number.

243664645321 is a deficient number, since it is larger than the sum of its proper divisors (11592951479).

243664645321 is a wasteful number, since it uses less digits than its factorization.

243664645321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106357439.

The product of its digits is 2488320, while the sum is 46.

The spelling of 243664645321 in words is "two hundred forty-three billion, six hundred sixty-four million, six hundred forty-five thousand, three hundred twenty-one".