243221033665 has 16 divisors (see below), whose sum is σ = 308422033920. Its totient is φ = 183618662400.

The previous prime is 243221033647. The next prime is 243221033669. The reversal of 243221033665 is 566330122342.

It is not a de Polignac number, because 243221033665 - 2¹⁷ = 243220902593 is a prime.

It is a super-3 number, since 3×243221033665³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (243221033669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4956561 + ... + 5005390.

It is an arithmetic number, because the mean of its divisors is an integer number (19276377120).

Almost surely, 2^243221033665 is an apocalyptic number.

It is an amenable number.

243221033665 is a deficient number, since it is larger than the sum of its proper divisors (65201000255).

243221033665 is a wasteful number, since it uses less digits than its factorization.

243221033665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9962232.

The product of its (nonzero) digits is 155520, while the sum is 37.

The spelling of 243221033665 in words is "two hundred forty-three billion, two hundred twenty-one million, thirty-three thousand, six hundred sixty-five".