243997228178 has 54 divisors (see below), whose sum is σ = 407334140031. Its totient is φ = 109535148800.

The previous prime is 243997228141. The next prime is 243997228207. The reversal of 243997228178 is 871822799342.

It can be written as a sum of positive squares in 5 ways, for example, as 23100048169 + 220897180009 = 151987^2 + 469997^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=349283.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243997228178.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 868317398 + ... + 868317678.

Almost surely, 2^243997228178 is an apocalyptic number.

243997228178 is a deficient number, since it is larger than the sum of its proper divisors (163336911853).

243997228178 is an equidigital number, since it uses as much as digits as its factorization.

243997228178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812 (or 407 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 62.

The spelling of 243997228178 in words is "two hundred forty-three billion, nine hundred ninety-seven million, two hundred twenty-eight thousand, one hundred seventy-eight".