643504464983 has 16 divisors (see below), whose sum is σ = 654449544000. Its totient is φ = 632651365632.

The previous prime is 643504464929. The next prime is 643504464989. The reversal of 643504464983 is 389464405346.

It is a cyclic number.

It is not a de Polignac number, because 643504464983 - 2⁶ = 643504464919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643504464989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12159566 + ... + 12212372.

It is an arithmetic number, because the mean of its divisors is an integer number (40903096500).

Almost surely, 2^643504464983 is an apocalyptic number.

643504464983 is a deficient number, since it is larger than the sum of its proper divisors (10945079017).

643504464983 is a wasteful number, since it uses less digits than its factorization.

643504464983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53674.

The product of its (nonzero) digits is 29859840, while the sum is 56.

The spelling of 643504464983 in words is "six hundred forty-three billion, five hundred four million, four hundred sixty-four thousand, nine hundred eighty-three".