643464260016 has 20 divisors (see below), whose sum is σ = 1662282671832. Its totient is φ = 214488086656.

The previous prime is 643464260009. The next prime is 643464260027. The reversal of 643464260016 is 610062464346.

643464260016 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 643464260016.

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, 6702752661 + ... + 6702752756.

Almost surely, 2^643464260016 is an apocalyptic number.

It is an amenable number.

643464260016 is an abundant number, since it is smaller than the sum of its proper divisors (1018818411816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643464260016 is a wasteful number, since it uses less digits than its factorization.

643464260016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13405505428 (or 13405505422 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 42.

The spelling of 643464260016 in words is "six hundred forty-three billion, four hundred sixty-four million, two hundred sixty thousand, sixteen".