643351334564 has 12 divisors (see below), whose sum is σ = 1185120879600. Its totient is φ = 304745368968.

The previous prime is 643351334543. The next prime is 643351334569. The reversal of 643351334564 is 465433153346.

643351334564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×643351334564² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (643351334569) 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, 4232574494 + ... + 4232574645.

It is an arithmetic number, because the mean of its divisors is an integer number (98760073300).

Almost surely, 2^643351334564 is an apocalyptic number.

It is an amenable number.

643351334564 is a deficient number, since it is larger than the sum of its proper divisors (541769545036).

643351334564 is a wasteful number, since it uses less digits than its factorization.

643351334564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8465149162 (or 8465149160 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 47.

The spelling of 643351334564 in words is "six hundred forty-three billion, three hundred fifty-one million, three hundred thirty-four thousand, five hundred sixty-four".