663503257 has 2 divisors, whose sum is σ = 663503258. Its totient is φ = 663503256.

The previous prime is 663503227. The next prime is 663503303. The reversal of 663503257 is 752305366.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 652240521 + 11262736 = 25539^2 + 3356^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663503257 is a prime.

It is not a weakly prime, because it can be changed into another prime (663503227) 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, 331751628 + 331751629.

It is an arithmetic number, because the mean of its divisors is an integer number (331751629).

Almost surely, 2^663503257 is an apocalyptic number.

It is an amenable number.

663503257 is a deficient number, since it is larger than the sum of its proper divisors (1).

663503257 is an equidigital number, since it uses as much as digits as its factorization.

663503257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 113400, while the sum is 37.

The square root of 663503257 is about 25758.5569665694. The cubic root of 663503257 is about 872.1965269982.

The spelling of 663503257 in words is "six hundred sixty-three million, five hundred three thousand, two hundred fifty-seven".