663210397 has 2 divisors, whose sum is σ = 663210398. Its totient is φ = 663210396.

The previous prime is 663210349. The next prime is 663210403. The reversal of 663210397 is 793012366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 601917156 + 61293241 = 24534^2 + 7829^2 .

It is a cyclic number.

It is not a de Polignac number, because 663210397 - 2¹⁵ = 663177629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663310397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331605198 + 331605199.

It is an arithmetic number, because the mean of its divisors is an integer number (331605199).

Almost surely, 2^663210397 is an apocalyptic number.

It is an amenable number.

663210397 is a deficient number, since it is larger than the sum of its proper divisors (1).

663210397 is an equidigital number, since it uses as much as digits as its factorization.

663210397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 37.

The square root of 663210397 is about 25752.8716262866. The cubic root of 663210397 is about 872.0681834608.

The spelling of 663210397 in words is "six hundred sixty-three million, two hundred ten thousand, three hundred ninety-seven".