643471352672 has 24 divisors (see below), whose sum is σ = 1284188123736. Its totient is φ = 317328337152.

The previous prime is 643471352669. The next prime is 643471352687. The reversal of 643471352672 is 276253174346.

It is a self number, because there is not a number n which added to its sum of digits gives 643471352672.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137726978 + ... + 137731649.

It is an arithmetic number, because the mean of its divisors is an integer number (53507838489).

Almost surely, 2^643471352672 is an apocalyptic number.

It is an amenable number.

643471352672 is a deficient number, since it is larger than the sum of its proper divisors (640716771064).

643471352672 is a wasteful number, since it uses less digits than its factorization.

643471352672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275458710 (or 275458702 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 50.

The spelling of 643471352672 in words is "six hundred forty-three billion, four hundred seventy-one million, three hundred fifty-two thousand, six hundred seventy-two".