640163 has 2 divisors, whose sum is σ = 640164. Its totient is φ = 640162.

The previous prime is 640153. The next prime is 640193. The reversal of 640163 is 361046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640163 - 2⁶ = 640099 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (640153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320081 + 320082.

It is an arithmetic number, because the mean of its divisors is an integer number (320082).

2⁶⁴⁰¹⁶³ is an apocalyptic number.

640163 is a deficient number, since it is larger than the sum of its proper divisors (1).

640163 is an equidigital number, since it uses as much as digits as its factorization.

640163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 640163 is about 800.1018685143. The cubic root of 640163 is about 86.1847030814.

The spelling of 640163 in words is "six hundred forty thousand, one hundred sixty-three".