663484609 has 2 divisors, whose sum is σ = 663484610. Its totient is φ = 663484608.

The previous prime is 663484607. The next prime is 663484621. The reversal of 663484609 is 906484366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 658435600 + 5049009 = 25660^2 + 2247^2 .

It is a cyclic number.

It is not a de Polignac number, because 663484609 - 2¹ = 663484607 is a prime.

Together with 663484607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (663484603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331742304 + 331742305.

It is an arithmetic number, because the mean of its divisors is an integer number (331742305).

Almost surely, 2^663484609 is an apocalyptic number.

It is an amenable number.

663484609 is a deficient number, since it is larger than the sum of its proper divisors (1).

663484609 is an equidigital number, since it uses as much as digits as its factorization.

663484609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 46.

The square root of 663484609 is about 25758.1949872269. The cubic root of 663484609 is about 872.1883557883.

The spelling of 663484609 in words is "six hundred sixty-three million, four hundred eighty-four thousand, six hundred nine".