640599653 has 2 divisors, whose sum is σ = 640599654. Its totient is φ = 640599652.

The previous prime is 640599629. The next prime is 640599667. The reversal of 640599653 is 356995046.

640599653 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 549339844 + 91259809 = 23438^2 + 9553^2 .

It is a cyclic number.

It is not a de Polignac number, because 640599653 - 2¹⁶ = 640534117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 640599598 and 640599607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640599053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320299826 + 320299827.

It is an arithmetic number, because the mean of its divisors is an integer number (320299827).

Almost surely, 2^640599653 is an apocalyptic number.

It is an amenable number.

640599653 is a deficient number, since it is larger than the sum of its proper divisors (1).

640599653 is an equidigital number, since it uses as much as digits as its factorization.

640599653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 874800, while the sum is 47.

The square root of 640599653 is about 25310.0701895510. The cubic root of 640599653 is about 862.0429405848.

The spelling of 640599653 in words is "six hundred forty million, five hundred ninety-nine thousand, six hundred fifty-three".