663645610063651 has 2 divisors, whose sum is σ = 663645610063652. Its totient is φ = 663645610063650.

The previous prime is 663645610063643. The next prime is 663645610063669. The reversal of 663645610063651 is 156360016546366.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 663645610063651 - 2³ = 663645610063643 is a prime.

It is not a weakly prime, because it can be changed into another prime (663645610063351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331822805031825 + 331822805031826.

It is an arithmetic number, because the mean of its divisors is an integer number (331822805031826).

Almost surely, 2^{663645610063651} is an apocalyptic number.

663645610063651 is a deficient number, since it is larger than the sum of its proper divisors (1).

663645610063651 is an equidigital number, since it uses as much as digits as its factorization.

663645610063651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41990400, while the sum is 58.

The spelling of 663645610063651 in words is "six hundred sixty-three trillion, six hundred forty-five billion, six hundred ten million, sixty-three thousand, six hundred fifty-one".