645566163223 has 16 divisors (see below), whose sum is σ = 664191360000. Its totient is φ = 627230710656.

The previous prime is 645566163181. The next prime is 645566163239. The reversal of 645566163223 is 322361665546.

It is a cyclic number.

It is not a de Polignac number, because 645566163223 - 2⁹ = 645566162711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645566163023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3279903 + ... + 3471151.

It is an arithmetic number, because the mean of its divisors is an integer number (41511960000).

Almost surely, 2^645566163223 is an apocalyptic number.

645566163223 is a deficient number, since it is larger than the sum of its proper divisors (18625196777).

645566163223 is a wasteful number, since it uses less digits than its factorization.

645566163223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192006.

The product of its digits is 4665600, while the sum is 49.

The spelling of 645566163223 in words is "six hundred forty-five billion, five hundred sixty-six million, one hundred sixty-three thousand, two hundred twenty-three".