243398226661 has 2 divisors, whose sum is σ = 243398226662. Its totient is φ = 243398226660.

The previous prime is 243398226641. The next prime is 243398226667. The reversal of 243398226661 is 166622893342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 222860470561 + 20537756100 = 472081^2 + 143310^2 .

It is a cyclic number.

It is not a de Polignac number, because 243398226661 - 2⁵ = 243398226629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243398226599 and 243398226608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243398226667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121699113330 + 121699113331.

It is an arithmetic number, because the mean of its divisors is an integer number (121699113331).

Almost surely, 2^243398226661 is an apocalyptic number.

It is an amenable number.

243398226661 is a deficient number, since it is larger than the sum of its proper divisors (1).

243398226661 is an equidigital number, since it uses as much as digits as its factorization.

243398226661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4478976, while the sum is 52.

The spelling of 243398226661 in words is "two hundred forty-three billion, three hundred ninety-eight million, two hundred twenty-six thousand, six hundred sixty-one".