663551699 has 2 divisors, whose sum is σ = 663551700. Its totient is φ = 663551698.

The previous prime is 663551671. The next prime is 663551723. The reversal of 663551699 is 996155366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 663551699 - 2²⁰ = 662503123 is a prime.

It is not a weakly prime, because it can be changed into another prime (663551659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331775849 + 331775850.

It is an arithmetic number, because the mean of its divisors is an integer number (331775850).

Almost surely, 2^663551699 is an apocalyptic number.

663551699 is a deficient number, since it is larger than the sum of its proper divisors (1).

663551699 is an equidigital number, since it uses as much as digits as its factorization.

663551699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1312200, while the sum is 50.

The square root of 663551699 is about 25759.4972582929. The cubic root of 663551699 is about 872.2177526744.

The spelling of 663551699 in words is "six hundred sixty-three million, five hundred fifty-one thousand, six hundred ninety-nine".