663446501321 has 2 divisors, whose sum is σ = 663446501322. Its totient is φ = 663446501320.

The previous prime is 663446501261. The next prime is 663446501371. The reversal of 663446501321 is 123105644366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 661927060921 + 1519440400 = 813589^2 + 38980^2 .

It is a cyclic number.

It is not a de Polignac number, because 663446501321 - 2¹⁴ = 663446484937 is a prime.

It is a super-2 number, since 2×663446501321² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (663446501371) 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, 331723250660 + 331723250661.

It is an arithmetic number, because the mean of its divisors is an integer number (331723250661).

Almost surely, 2^663446501321 is an apocalyptic number.

It is an amenable number.

663446501321 is a deficient number, since it is larger than the sum of its proper divisors (1).

663446501321 is an equidigital number, since it uses as much as digits as its factorization.

663446501321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 663446501321 in words is "six hundred sixty-three billion, four hundred forty-six million, five hundred one thousand, three hundred twenty-one".