640527570217 has 2 divisors, whose sum is σ = 640527570218. Its totient is φ = 640527570216.

The previous prime is 640527570169. The next prime is 640527570223. The reversal of 640527570217 is 712075725046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 615415146256 + 25112423961 = 784484^2 + 158469^2 .

It is a cyclic number.

It is not a de Polignac number, because 640527570217 - 2³⁵ = 606167831849 is a prime.

It is not a weakly prime, because it can be changed into another prime (640527570257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320263785108 + 320263785109.

It is an arithmetic number, because the mean of its divisors is an integer number (320263785109).

Almost surely, 2^640527570217 is an apocalyptic number.

It is an amenable number.

640527570217 is a deficient number, since it is larger than the sum of its proper divisors (1).

640527570217 is an equidigital number, since it uses as much as digits as its factorization.

640527570217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 823200, while the sum is 46.

The spelling of 640527570217 in words is "six hundred forty billion, five hundred twenty-seven million, five hundred seventy thousand, two hundred seventeen".