663308609 has 4 divisors (see below), whose sum is σ = 663407316. Its totient is φ = 663209904.

The previous prime is 663308593. The next prime is 663308617. The reversal of 663308609 is 906803366.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 347002384 + 316306225 = 18628^2 + 17785^2 .

It is a cyclic number.

It is not a de Polignac number, because 663308609 - 2⁴ = 663308593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663308629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38474 + ... + 52979.

It is an arithmetic number, because the mean of its divisors is an integer number (165851829).

Almost surely, 2^663308609 is an apocalyptic number.

It is an amenable number.

663308609 is a deficient number, since it is larger than the sum of its proper divisors (98707).

663308609 is an equidigital number, since it uses as much as digits as its factorization.

663308609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98706.

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 663308609 is about 25754.7783721779. The cubic root of 663308609 is about 872.1112282891. Note that the first 3 decimals are identical.

The spelling of 663308609 in words is "six hundred sixty-three million, three hundred eight thousand, six hundred nine".