1643106663 has 12 divisors (see below), whose sum is σ = 2589137928. Its totient is φ = 995822160.

The previous prime is 1643106653. The next prime is 1643106713. The reversal of 1643106663 is 3666013461.

It is not a de Polignac number, because 1643106663 - 2⁵ = 1643106631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643106653) 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, 8298420 + ... + 8298617.

It is an arithmetic number, because the mean of its divisors is an integer number (215761494).

Almost surely, 2^1643106663 is an apocalyptic number.

1643106663 is a deficient number, since it is larger than the sum of its proper divisors (946031265).

1643106663 is a wasteful number, since it uses less digits than its factorization.

1643106663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16597054 (or 16597051 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 1643106663 is about 40535.2521023368. The cubic root of 1643106663 is about 1180.0178736640.

The spelling of 1643106663 in words is "one billion, six hundred forty-three million, one hundred six thousand, six hundred sixty-three".