646360217 has 2 divisors, whose sum is σ = 646360218. Its totient is φ = 646360216.

The previous prime is 646360201. The next prime is 646360241. The reversal of 646360217 is 712063646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 628204096 + 18156121 = 25064^2 + 4261^2 .

It is a cyclic number.

It is not a de Polignac number, because 646360217 - 2⁴ = 646360201 is a prime.

It is not a weakly prime, because it can be changed into another prime (646362217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323180108 + 323180109.

It is an arithmetic number, because the mean of its divisors is an integer number (323180109).

Almost surely, 2^646360217 is an apocalyptic number.

It is an amenable number.

646360217 is a deficient number, since it is larger than the sum of its proper divisors (1).

646360217 is an equidigital number, since it uses as much as digits as its factorization.

646360217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 646360217 is about 25423.6153408598. The cubic root of 646360217 is about 864.6191946483.

The spelling of 646360217 in words is "six hundred forty-six million, three hundred sixty thousand, two hundred seventeen".