646560361 has 2 divisors, whose sum is σ = 646560362. Its totient is φ = 646560360.

The previous prime is 646560359. The next prime is 646560377. The reversal of 646560361 is 163065646.

646560361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 426216025 + 220344336 = 20645^2 + 14844^2 .

It is a cyclic number.

It is not a de Polignac number, because 646560361 - 2¹ = 646560359 is a prime.

Together with 646560359, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 646560361.

It is not a weakly prime, because it can be changed into another prime (646560391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323280180 + 323280181.

It is an arithmetic number, because the mean of its divisors is an integer number (323280181).

Almost surely, 2^646560361 is an apocalyptic number.

It is an amenable number.

646560361 is a deficient number, since it is larger than the sum of its proper divisors (1).

646560361 is an equidigital number, since it uses as much as digits as its factorization.

646560361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 646560361 is about 25427.5512191009. The cubic root of 646560361 is about 864.7084279073.

The spelling of 646560361 in words is "six hundred forty-six million, five hundred sixty thousand, three hundred sixty-one".