663645313 has 2 divisors, whose sum is σ = 663645314. Its totient is φ = 663645312.

The previous prime is 663645233. The next prime is 663645317. The reversal of 663645313 is 313546366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 657050689 + 6594624 = 25633^2 + 2568^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663645313 is a prime.

It is equal to p_34465816 and since 663645313 and 34465816 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 (663645317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331822656 + 331822657.

It is an arithmetic number, because the mean of its divisors is an integer number (331822657).

Almost surely, 2^663645313 is an apocalyptic number.

It is an amenable number.

663645313 is a deficient number, since it is larger than the sum of its proper divisors (1).

663645313 is an equidigital number, since it uses as much as digits as its factorization.

663645313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 37.

The square root of 663645313 is about 25761.3142715972. The cubic root of 663645313 is about 872.2587682945.

The spelling of 663645313 in words is "six hundred sixty-three million, six hundred forty-five thousand, three hundred thirteen".