8681663 has 2 divisors, whose sum is σ = 8681664. Its totient is φ = 8681662.

The previous prime is 8681639. The next prime is 8681669. The reversal of 8681663 is 3661868.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8681663 - 2¹⁸ = 8419519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8681669) 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, 4340831 + 4340832.

It is an arithmetic number, because the mean of its divisors is an integer number (4340832).

Almost surely, 2^8681663 is an apocalyptic number.

8681663 is a deficient number, since it is larger than the sum of its proper divisors (1).

8681663 is an equidigital number, since it uses as much as digits as its factorization.

8681663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 38.

The square root of 8681663 is about 2946.4661885045. The cubic root of 8681663 is about 205.5264123064.

The spelling of 8681663 in words is "eight million, six hundred eighty-one thousand, six hundred sixty-three".