663487009 has 2 divisors, whose sum is σ = 663487010. Its totient is φ = 663487008.

The previous prime is 663486983. The next prime is 663487031. The reversal of 663487009 is 900784366.

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., 420127009 + 243360000 = 20497^2 + 15600^2 .

It is a cyclic number.

It is not a de Polignac number, because 663487009 - 2⁷ = 663486881 is a prime.

It is a super-2 number, since 2×663487009² = 880430022223532162, which contains 22 as substring.

It is equal to p_34457992 and since 663487009 and 34457992 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (663487609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331743504 + 331743505.

It is an arithmetic number, because the mean of its divisors is an integer number (331743505).

Almost surely, 2^663487009 is an apocalyptic number.

It is an amenable number.

663487009 is a deficient number, since it is larger than the sum of its proper divisors (1).

663487009 is an equidigital number, since it uses as much as digits as its factorization.

663487009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 663487009 is about 25758.2415743001. The cubic root of 663487009 is about 872.1894074326.

The spelling of 663487009 in words is "six hundred sixty-three million, four hundred eighty-seven thousand, nine".