223298656781 has 2 divisors, whose sum is σ = 223298656782. Its totient is φ = 223298656780.

The previous prime is 223298656771. The next prime is 223298656783. The reversal of 223298656781 is 187656892322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205987991881 + 17310664900 = 453859^2 + 131570^2 .

It is a cyclic number.

It is not a de Polignac number, because 223298656781 - 2³⁴ = 206118787597 is a prime.

It is a super-2 number, since 2×223298656781² (a number of 23 digits) contains 22 as substring.

Together with 223298656783, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 223298656781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223298656783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111649328390 + 111649328391.

It is an arithmetic number, because the mean of its divisors is an integer number (111649328391).

Almost surely, 2^223298656781 is an apocalyptic number.

It is an amenable number.

223298656781 is a deficient number, since it is larger than the sum of its proper divisors (1).

223298656781 is an equidigital number, since it uses as much as digits as its factorization.

223298656781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17418240, while the sum is 59.

The spelling of 223298656781 in words is "two hundred twenty-three billion, two hundred ninety-eight million, six hundred fifty-six thousand, seven hundred eighty-one".