643312438863 has 8 divisors (see below), whose sum is σ = 887327502000. Its totient is φ = 414086167488.

The previous prime is 643312438861. The next prime is 643312438883. The reversal of 643312438863 is 368834213346.

643312438863 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 643312438863 - 2¹ = 643312438861 is a prime.

It is a super-2 number, since 2×643312438863² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643312438861) 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, 3697197838 + ... + 3697198011.

It is an arithmetic number, because the mean of its divisors is an integer number (110915937750).

Almost surely, 2^643312438863 is an apocalyptic number.

643312438863 is a deficient number, since it is larger than the sum of its proper divisors (244015063137).

643312438863 is a wasteful number, since it uses less digits than its factorization.

643312438863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7394395881.

The product of its digits is 5971968, while the sum is 51.

The spelling of 643312438863 in words is "six hundred forty-three billion, three hundred twelve million, four hundred thirty-eight thousand, eight hundred sixty-three".