243322653661 has 2 divisors, whose sum is σ = 243322653662. Its totient is φ = 243322653660.

The previous prime is 243322653649. The next prime is 243322653719. The reversal of 243322653661 is 166356223342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231764253561 + 11558400100 = 481419^2 + 107510^2 .

It is a cyclic number.

It is not a de Polignac number, because 243322653661 - 2⁷ = 243322653533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243322653611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121661326830 + 121661326831.

It is an arithmetic number, because the mean of its divisors is an integer number (121661326831).

Almost surely, 2^243322653661 is an apocalyptic number.

It is an amenable number.

243322653661 is a deficient number, since it is larger than the sum of its proper divisors (1).

243322653661 is an equidigital number, since it uses as much as digits as its factorization.

243322653661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 43.

The spelling of 243322653661 in words is "two hundred forty-three billion, three hundred twenty-two million, six hundred fifty-three thousand, six hundred sixty-one".