640562017 has 2 divisors, whose sum is σ = 640562018. Its totient is φ = 640562016.

The previous prime is 640562003. The next prime is 640562033. The reversal of 640562017 is 710265046.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 510579216 + 129982801 = 22596^2 + 11401^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640562017 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640562017.

It is not a weakly prime, because it can be changed into another prime (640562317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320281008 + 320281009.

It is an arithmetic number, because the mean of its divisors is an integer number (320281009).

Almost surely, 2^640562017 is an apocalyptic number.

It is an amenable number.

640562017 is a deficient number, since it is larger than the sum of its proper divisors (1).

640562017 is an equidigital number, since it uses as much as digits as its factorization.

640562017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 640562017 is about 25309.3266800996. The cubic root of 640562017 is about 862.0260582343.

The spelling of 640562017 in words is "six hundred forty million, five hundred sixty-two thousand, seventeen".