223918204661 has 2 divisors, whose sum is σ = 223918204662. Its totient is φ = 223918204660.

The previous prime is 223918204639. The next prime is 223918204663. The reversal of 223918204661 is 166402819322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223805632561 + 112572100 = 473081^2 + 10610^2 .

It is a cyclic number.

It is not a de Polignac number, because 223918204661 - 2¹⁰ = 223918203637 is a prime.

It is a Sophie Germain prime.

Together with 223918204663, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223918204663) by changing a digit.

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 as a sum of consecutive naturals, namely, 111959102330 + 111959102331.

It is an arithmetic number, because the mean of its divisors is an integer number (111959102331).

Almost surely, 2^223918204661 is an apocalyptic number.

It is an amenable number.

223918204661 is a deficient number, since it is larger than the sum of its proper divisors (1).

223918204661 is an equidigital number, since it uses as much as digits as its factorization.

223918204661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 223918204661 in words is "two hundred twenty-three billion, nine hundred eighteen million, two hundred four thousand, six hundred sixty-one".