643874478346 has 8 divisors (see below), whose sum is σ = 1053612782784. Its totient is φ = 292670217420.

The previous prime is 643874478319. The next prime is 643874478349.

643874478346 is nontrivially palindromic in base 10.

643874478346 is digitally balanced in base 2, because in such base 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 an unprimeable number, because it can be changed into a prime (643874478349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14633510850 + ... + 14633510893.

It is an arithmetic number, because the mean of its divisors is an integer number (131701597848).

Almost surely, 2^643874478346 is an apocalyptic number.

643874478346 is a deficient number, since it is larger than the sum of its proper divisors (409738304438).

643874478346 is a wasteful number, since it uses less digits than its factorization.

643874478346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29267021756.

The product of its digits is 260112384, while the sum is 64.

The spelling of 643874478346 in words is "six hundred forty-three billion, eight hundred seventy-four million, four hundred seventy-eight thousand, three hundred forty-six".