640314940717 has 2 divisors, whose sum is σ = 640314940718. Its totient is φ = 640314940716.

The previous prime is 640314940703. The next prime is 640314940763. The reversal of 640314940717 is 717049413046.

It is an a-pointer prime, because the next prime (640314940763) can be obtained adding 640314940717 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 367406911881 + 272908028836 = 606141^2 + 522406^2 .

It is a cyclic number.

It is not a de Polignac number, because 640314940717 - 2²⁷ = 640180722989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640314940417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320157470358 + 320157470359.

It is an arithmetic number, because the mean of its divisors is an integer number (320157470359).

Almost surely, 2^640314940717 is an apocalyptic number.

It is an amenable number.

640314940717 is a deficient number, since it is larger than the sum of its proper divisors (1).

640314940717 is an equidigital number, since it uses as much as digits as its factorization.

640314940717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 46.

The spelling of 640314940717 in words is "six hundred forty billion, three hundred fourteen million, nine hundred forty thousand, seven hundred seventeen".