640206575163 has 12 divisors (see below), whose sum is σ = 924752193768. Its totient is φ = 426800062080.

The previous prime is 640206575153. The next prime is 640206575231. The reversal of 640206575163 is 361575602046.

640206575163 is a `hidden beast` number, since 6 + 40 + 20 + 6 + 575 + 16 + 3 = 666.

It is not a de Polignac number, because 640206575163 - 2⁵ = 640206575131 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (640206575153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 762283 + ... + 1364363.

It is an arithmetic number, because the mean of its divisors is an integer number (77062682814).

Almost surely, 2^640206575163 is an apocalyptic number.

640206575163 is a deficient number, since it is larger than the sum of its proper divisors (284545618605).

640206575163 is a wasteful number, since it uses less digits than its factorization.

640206575163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720234 (or 720231 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 45.

The spelling of 640206575163 in words is "six hundred forty billion, two hundred six million, five hundred seventy-five thousand, one hundred sixty-three".