643164434884 has 12 divisors (see below), whose sum is σ = 1191745864764. Its totient is φ = 302665616384.

The previous prime is 643164434837. The next prime is 643164434929. The reversal of 643164434884 is 488434461346.

It can be written as a sum of positive squares in 2 ways, for example, as 464472236484 + 178692198400 = 681522^2 + 422720^2 .

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, 4729150189 + ... + 4729150324.

It is an arithmetic number, because the mean of its divisors is an integer number (99312155397).

Almost surely, 2^643164434884 is an apocalyptic number.

It is an amenable number.

643164434884 is a deficient number, since it is larger than the sum of its proper divisors (548581429880).

643164434884 is a wasteful number, since it uses less digits than its factorization.

643164434884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9458300534 (or 9458300532 counting only the distinct ones).

The product of its digits is 21233664, while the sum is 55.

The spelling of 643164434884 in words is "six hundred forty-three billion, one hundred sixty-four million, four hundred thirty-four thousand, eight hundred eighty-four".