220666489 has 2 divisors, whose sum is σ = 220666490. Its totient is φ = 220666488.

The previous prime is 220666471. The next prime is 220666493. The reversal of 220666489 is 984666022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218803264 + 1863225 = 14792^2 + 1365^2 .

It is a cyclic number.

It is not a de Polignac number, because 220666489 - 2¹⁹ = 220142201 is a prime.

It is not a weakly prime, because it can be changed into another prime (220666429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110333244 + 110333245.

It is an arithmetic number, because the mean of its divisors is an integer number (110333245).

Almost surely, 2^220666489 is an apocalyptic number.

It is an amenable number.

220666489 is a deficient number, since it is larger than the sum of its proper divisors (1).

220666489 is an equidigital number, since it uses as much as digits as its factorization.

220666489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 43.

The square root of 220666489 is about 14854.8473233487. The cubic root of 220666489 is about 604.2900754600.

The spelling of 220666489 in words is "two hundred twenty million, six hundred sixty-six thousand, four hundred eighty-nine".