223630661 has 2 divisors, whose sum is σ = 223630662. Its totient is φ = 223630660.

The previous prime is 223630619. The next prime is 223630681. The reversal of 223630661 is 166036322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209236225 + 14394436 = 14465^2 + 3794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223630661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223630681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111815330 + 111815331.

It is an arithmetic number, because the mean of its divisors is an integer number (111815331).

Almost surely, 2^223630661 is an apocalyptic number.

It is an amenable number.

223630661 is a deficient number, since it is larger than the sum of its proper divisors (1).

223630661 is an equidigital number, since it uses as much as digits as its factorization.

223630661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 223630661 is about 14954.2857067798. The cubic root of 223630661 is about 606.9838218436.

Adding to 223630661 its reverse (166036322), we get a palindrome (389666983).

The spelling of 223630661 in words is "two hundred twenty-three million, six hundred thirty thousand, six hundred sixty-one".