243913738668 has 12 divisors (see below), whose sum is σ = 569132056920. Its totient is φ = 81304579552.

The previous prime is 243913738637. The next prime is 243913738681. The reversal of 243913738668 is 866837319342.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×243913738668² (a number of 24 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 10163072433 + ... + 10163072456.

It is an arithmetic number, because the mean of its divisors is an integer number (47427671410).

Almost surely, 2^243913738668 is an apocalyptic number.

It is an amenable number.

243913738668 is an abundant number, since it is smaller than the sum of its proper divisors (325218318252).

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

243913738668 is a wasteful number, since it uses less digits than its factorization.

243913738668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20326144896 (or 20326144894 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 60.

The spelling of 243913738668 in words is "two hundred forty-three billion, nine hundred thirteen million, seven hundred thirty-eight thousand, six hundred sixty-eight".