646043430797 has 2 divisors, whose sum is σ = 646043430798. Its totient is φ = 646043430796.

The previous prime is 646043430779. The next prime is 646043430847. The reversal of 646043430797 is 797034340646.

Together with previous prime (646043430779) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 423845269156 + 222198161641 = 651034^2 + 471379^2 .

It is a cyclic number.

It is not a de Polignac number, because 646043430797 - 2³⁶ = 577323954061 is a prime.

It is a super-2 number, since 2×646043430797² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646043430737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323021715398 + 323021715399.

It is an arithmetic number, because the mean of its divisors is an integer number (323021715399).

Almost surely, 2^646043430797 is an apocalyptic number.

It is an amenable number.

646043430797 is a deficient number, since it is larger than the sum of its proper divisors (1).

646043430797 is an equidigital number, since it uses as much as digits as its factorization.

646043430797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9144576, while the sum is 53.

The spelling of 646043430797 in words is "six hundred forty-six billion, forty-three million, four hundred thirty thousand, seven hundred ninety-seven".