640124717 has 2 divisors, whose sum is σ = 640124718. Its totient is φ = 640124716.

The previous prime is 640124699. The next prime is 640124741. The reversal of 640124717 is 717421046.

640124717 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., 471280681 + 168844036 = 21709^2 + 12994^2 .

It is a cyclic number.

It is not a de Polignac number, because 640124717 - 2⁸ = 640124461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640124747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320062358 + 320062359.

It is an arithmetic number, because the mean of its divisors is an integer number (320062359).

Almost surely, 2^640124717 is an apocalyptic number.

It is an amenable number.

640124717 is a deficient number, since it is larger than the sum of its proper divisors (1).

640124717 is an equidigital number, since it uses as much as digits as its factorization.

640124717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 640124717 is about 25300.6860974164. The cubic root of 640124717 is about 861.8298504252.

The spelling of 640124717 in words is "six hundred forty million, one hundred twenty-four thousand, seven hundred seventeen".