663075641 has 2 divisors, whose sum is σ = 663075642. Its totient is φ = 663075640.

The previous prime is 663075619. The next prime is 663075649. The reversal of 663075641 is 146570366.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 509811241 + 153264400 = 22579^2 + 12380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663075641 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 663075595 and 663075604.

It is not a weakly prime, because it can be changed into another prime (663075649) 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, 331537820 + 331537821.

It is an arithmetic number, because the mean of its divisors is an integer number (331537821).

Almost surely, 2^663075641 is an apocalyptic number.

It is an amenable number.

663075641 is a deficient number, since it is larger than the sum of its proper divisors (1).

663075641 is an equidigital number, since it uses as much as digits as its factorization.

663075641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 663075641 is about 25750.2551637843. The cubic root of 663075641 is about 872.0091150360.

The spelling of 663075641 in words is "six hundred sixty-three million, seventy-five thousand, six hundred forty-one".