656128223 has 2 divisors, whose sum is σ = 656128224. Its totient is φ = 656128222.

The previous prime is 656128201. The next prime is 656128267. The reversal of 656128223 is 322821656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 656128223 - 2¹⁴ = 656111839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656128283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328064111 + 328064112.

It is an arithmetic number, because the mean of its divisors is an integer number (328064112).

Almost surely, 2^656128223 is an apocalyptic number.

656128223 is a deficient number, since it is larger than the sum of its proper divisors (1).

656128223 is an equidigital number, since it uses as much as digits as its factorization.

656128223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 35.

The square root of 656128223 is about 25614.9999609604. Note that the first 4 decimals coincide. The cubic root of 656128223 is about 868.9529055032.

Adding to 656128223 its reverse (322821656), we get a palindrome (978949879).

The spelling of 656128223 in words is "six hundred fifty-six million, one hundred twenty-eight thousand, two hundred twenty-three".