1643317863 has 16 divisors (see below), whose sum is σ = 2392675200. Its totient is φ = 994952480.

The previous prime is 1643317853. The next prime is 1643317867. The reversal of 1643317863 is 3687133461.

It is a happy number.

1643317863 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 1643317863 - 2¹³ = 1643309671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643317867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9193 + ... + 58061.

It is an arithmetic number, because the mean of its divisors is an integer number (149542200).

Almost surely, 2^1643317863 is an apocalyptic number.

1643317863 is a deficient number, since it is larger than the sum of its proper divisors (749357337).

1643317863 is a wasteful number, since it uses less digits than its factorization.

1643317863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49902.

The product of its digits is 217728, while the sum is 42.

The square root of 1643317863 is about 40537.8571584636. The cubic root of 1643317863 is about 1180.0684301501.

The spelling of 1643317863 in words is "one billion, six hundred forty-three million, three hundred seventeen thousand, eight hundred sixty-three".