1663459717 has 2 divisors, whose sum is σ = 1663459718. Its totient is φ = 1663459716.

The previous prime is 1663459711. The next prime is 1663459739. The reversal of 1663459717 is 7179543661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1634665761 + 28793956 = 40431^2 + 5366^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663459717 - 2¹¹ = 1663457669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1663459711) 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, 831729858 + 831729859.

It is an arithmetic number, because the mean of its divisors is an integer number (831729859).

Almost surely, 2^1663459717 is an apocalyptic number.

It is an amenable number.

1663459717 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663459717 is an equidigital number, since it uses as much as digits as its factorization.

1663459717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 49.

The square root of 1663459717 is about 40785.5331827353. The cubic root of 1663459717 is about 1184.8701613753.

The spelling of 1663459717 in words is "one billion, six hundred sixty-three million, four hundred fifty-nine thousand, seven hundred seventeen".