663785249 has 2 divisors, whose sum is σ = 663785250. Its totient is φ = 663785248.

The previous prime is 663785219. The next prime is 663785261. The reversal of 663785249 is 942587366.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 654592225 + 9193024 = 25585^2 + 3032^2 .

It is a cyclic number.

It is not a de Polignac number, because 663785249 - 2¹⁶ = 663719713 is a prime.

It is a super-2 number, since 2×663785249² = 881221713579984002, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 663785197 and 663785206.

It is not a weakly prime, because it can be changed into another prime (663785209) 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, 331892624 + 331892625.

It is an arithmetic number, because the mean of its divisors is an integer number (331892625).

Almost surely, 2^663785249 is an apocalyptic number.

It is an amenable number.

663785249 is a deficient number, since it is larger than the sum of its proper divisors (1).

663785249 is an equidigital number, since it uses as much as digits as its factorization.

663785249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 50.

The square root of 663785249 is about 25764.0301389360. The cubic root of 663785249 is about 872.3200720374.

The spelling of 663785249 in words is "six hundred sixty-three million, seven hundred eighty-five thousand, two hundred forty-nine".