220866257 has 2 divisors, whose sum is σ = 220866258. Its totient is φ = 220866256.

The previous prime is 220866229. The next prime is 220866271. The reversal of 220866257 is 752668022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111851776 + 109014481 = 10576^2 + 10441^2 .

It is a cyclic number.

It is not a de Polignac number, because 220866257 - 2²⁰ = 219817681 is a prime.

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 220866257.

It is not a weakly prime, because it can be changed into another prime (220866287) 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, 110433128 + 110433129.

It is an arithmetic number, because the mean of its divisors is an integer number (110433129).

Almost surely, 2^220866257 is an apocalyptic number.

It is an amenable number.

220866257 is a deficient number, since it is larger than the sum of its proper divisors (1).

220866257 is an equidigital number, since it uses as much as digits as its factorization.

220866257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 220866257 is about 14861.5698026824. The cubic root of 220866257 is about 604.4723738088.

The spelling of 220866257 in words is "two hundred twenty million, eight hundred sixty-six thousand, two hundred fifty-seven".