663487609 has 2 divisors, whose sum is σ = 663487610. Its totient is φ = 663487608.

The previous prime is 663487567. The next prime is 663487639. The reversal of 663487609 is 906784366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 560363584 + 103124025 = 23672^2 + 10155^2 .

It is a cyclic number.

It is not a de Polignac number, because 663487609 - 2⁷ = 663487481 is a prime.

It is not a weakly prime, because it can be changed into another prime (663487639) 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, 331743804 + 331743805.

It is an arithmetic number, because the mean of its divisors is an integer number (331743805).

Almost surely, 2^663487609 is an apocalyptic number.

It is an amenable number.

663487609 is a deficient number, since it is larger than the sum of its proper divisors (1).

663487609 is an equidigital number, since it uses as much as digits as its factorization.

663487609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 49.

The square root of 663487609 is about 25758.2532210552. The cubic root of 663487609 is about 872.1896703433.

The spelling of 663487609 in words is "six hundred sixty-three million, four hundred eighty-seven thousand, six hundred nine".