640253163 has 8 divisors (see below), whose sum is σ = 931277376. Its totient is φ = 388032200.

The previous prime is 640253147. The next prime is 640253179. The reversal of 640253163 is 361352046.

It is an interprime number because it is at equal distance from previous prime (640253147) and next prime (640253179).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 640253163 - 2⁴ = 640253147 is a prime.

It is a super-2 number, since 2×640253163² = 819848225463009138, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 640253163.

It is not an unprimeable number, because it can be changed into a prime (640253183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9700773 + ... + 9700838.

It is an arithmetic number, because the mean of its divisors is an integer number (116409672).

Almost surely, 2^640253163 is an apocalyptic number.

640253163 is a deficient number, since it is larger than the sum of its proper divisors (291024213).

640253163 is a wasteful number, since it uses less digits than its factorization.

640253163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19401625.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 640253163 is about 25303.2243597530. The cubic root of 640253163 is about 861.8874908561.

The spelling of 640253163 in words is "six hundred forty million, two hundred fifty-three thousand, one hundred sixty-three".