643314855 has 8 divisors (see below), whose sum is σ = 1029303792. Its totient is φ = 343101248.

The previous prime is 643314827. The next prime is 643314857. The reversal of 643314855 is 558413346.

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 643314855 - 2¹⁹ = 642790567 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643314857) 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, 21443814 + ... + 21443843.

It is an arithmetic number, because the mean of its divisors is an integer number (128662974).

Almost surely, 2^643314855 is an apocalyptic number.

643314855 is a deficient number, since it is larger than the sum of its proper divisors (385988937).

643314855 is a wasteful number, since it uses less digits than its factorization.

643314855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42887665.

The product of its digits is 172800, while the sum is 39.

The square root of 643314855 is about 25363.6522409530. The cubic root of 643314855 is about 863.2591560160.

The spelling of 643314855 in words is "six hundred forty-three million, three hundred fourteen thousand, eight hundred fifty-five".