663390313 has 2 divisors, whose sum is σ = 663390314. Its totient is φ = 663390312.

The previous prime is 663390281. The next prime is 663390331. The reversal of 663390313 is 313093366.

663390313 = 18212² + 18213².

It is a happy number.

Together with next prime (663390331) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 331713369 + 331676944 = 18213^2 + 18212^2 .

It is a cyclic number.

It is not a de Polignac number, because 663390313 - 2⁵ = 663390281 is a prime.

It is not a weakly prime, because it can be changed into another prime (663390613) 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, 331695156 + 331695157.

It is an arithmetic number, because the mean of its divisors is an integer number (331695157).

Almost surely, 2^663390313 is an apocalyptic number.

663390313 is the 18213-rd centered square number.

It is an amenable number.

663390313 is a deficient number, since it is larger than the sum of its proper divisors (1).

663390313 is an equidigital number, since it uses as much as digits as its factorization.

663390313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 34.

The square root of 663390313 is about 25756.3645144263. The cubic root of 663390313 is about 872.1470346741.

The spelling of 663390313 in words is "six hundred sixty-three million, three hundred ninety thousand, three hundred thirteen".