645566163224 has 8 divisors (see below), whose sum is σ = 1210436556060. Its totient is φ = 322783081608.

The previous prime is 645566163181. The next prime is 645566163239. The reversal of 645566163224 is 422361665546.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40347885194 + ... + 40347885209.

Almost surely, 2^645566163224 is an apocalyptic number.

It is an amenable number.

645566163224 is a deficient number, since it is larger than the sum of its proper divisors (564870392836).

645566163224 is a wasteful number, since it uses less digits than its factorization.

645566163224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80695770409 (or 80695770405 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 50.

The spelling of 645566163224 in words is "six hundred forty-five billion, five hundred sixty-six million, one hundred sixty-three thousand, two hundred twenty-four".