646021263501473 has 2 divisors, whose sum is σ = 646021263501474. Its totient is φ = 646021263501472.

The previous prime is 646021263501347. The next prime is 646021263501479. The reversal of 646021263501473 is 374105362120646.

646021263501473 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (646021263501347) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 445987536585889 + 200033726915584 = 21118417^2 + 14143328^2 .

It is a cyclic number.

It is not a de Polignac number, because 646021263501473 - 2³⁶ = 645952544024737 is a prime.

It is a super-2 number, since 2×646021263501473² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (646021263501479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323010631750736 + 323010631750737.

It is an arithmetic number, because the mean of its divisors is an integer number (323010631750737).

Almost surely, 2^{646021263501473} is an apocalyptic number.

It is an amenable number.

646021263501473 is a deficient number, since it is larger than the sum of its proper divisors (1).

646021263501473 is an equidigital number, since it uses as much as digits as its factorization.

646021263501473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4354560, while the sum is 50.

The spelling of 646021263501473 in words is "six hundred forty-six trillion, twenty-one billion, two hundred sixty-three million, five hundred one thousand, four hundred seventy-three".