663622304026481 has 2 divisors, whose sum is σ = 663622304026482. Its totient is φ = 663622304026480.

The previous prime is 663622304026469. The next prime is 663622304026483. The reversal of 663622304026481 is 184620403226366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 565584285024256 + 98038019002225 = 23782016^2 + 9901415^2 .

It is a cyclic number.

It is not a de Polignac number, because 663622304026481 - 2¹⁸ = 663622303764337 is a prime.

It is a super-2 number, since 2×663622304026481² (a number of 30 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 663622304026483, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (663622304026483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331811152013240 + 331811152013241.

It is an arithmetic number, because the mean of its divisors is an integer number (331811152013241).

Almost surely, 2^{663622304026481} is an apocalyptic number.

It is an amenable number.

663622304026481 is a deficient number, since it is larger than the sum of its proper divisors (1).

663622304026481 is an equidigital number, since it uses as much as digits as its factorization.

663622304026481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11943936, while the sum is 53.

The spelling of 663622304026481 in words is "six hundred sixty-three trillion, six hundred twenty-two billion, three hundred four million, twenty-six thousand, four hundred eighty-one".