643358863 has 8 divisors (see below), whose sum is σ = 778518432. Its totient is φ = 519012096.

The previous prime is 643358851. The next prime is 643358893. The reversal of 643358863 is 368853346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 643358863 - 2⁵ = 643358831 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 (643358803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2703070 + ... + 2703307.

It is an arithmetic number, because the mean of its divisors is an integer number (97314804).

Almost surely, 2^643358863 is an apocalyptic number.

643358863 is a deficient number, since it is larger than the sum of its proper divisors (135159569).

643358863 is a wasteful number, since it uses less digits than its factorization.

643358863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5406401.

The product of its digits is 1244160, while the sum is 46.

The square root of 643358863 is about 25364.5197667924. The cubic root of 643358863 is about 863.2788402304.

The spelling of 643358863 in words is "six hundred forty-three million, three hundred fifty-eight thousand, eight hundred sixty-three".