663397698241 has 2 divisors, whose sum is σ = 663397698242. Its totient is φ = 663397698240.

The previous prime is 663397698233. The next prime is 663397698247. The reversal of 663397698241 is 142896793366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 519696810000 + 143700888241 = 720900^2 + 379079^2 .

It is a cyclic number.

It is not a de Polignac number, because 663397698241 - 2³ = 663397698233 is a prime.

It is not a weakly prime, because it can be changed into another prime (663397698247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331698849120 + 331698849121.

It is an arithmetic number, because the mean of its divisors is an integer number (331698849121).

Almost surely, 2^663397698241 is an apocalyptic number.

It is an amenable number.

663397698241 is a deficient number, since it is larger than the sum of its proper divisors (1).

663397698241 is an equidigital number, since it uses as much as digits as its factorization.

663397698241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70543872, while the sum is 64.

The spelling of 663397698241 in words is "six hundred sixty-three billion, three hundred ninety-seven million, six hundred ninety-eight thousand, two hundred forty-one".