657043223 has 2 divisors, whose sum is σ = 657043224. Its totient is φ = 657043222.

The previous prime is 657043201. The next prime is 657043241. The reversal of 657043223 is 322340756.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-657043223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 657043223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (657043423) 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, 328521611 + 328521612.

It is an arithmetic number, because the mean of its divisors is an integer number (328521612).

Almost surely, 2^657043223 is an apocalyptic number.

657043223 is a deficient number, since it is larger than the sum of its proper divisors (1).

657043223 is an equidigital number, since it uses as much as digits as its factorization.

657043223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 32.

The square root of 657043223 is about 25632.8543670033. The cubic root of 657043223 is about 869.3566490448.

Adding to 657043223 its reverse (322340756), we get a palindrome (979383979).

The spelling of 657043223 in words is "six hundred fifty-seven million, forty-three thousand, two hundred twenty-three".