643084864143 has 16 divisors (see below), whose sum is σ = 902651877120. Its totient is φ = 406124378496.

The previous prime is 643084864139. The next prime is 643084864153. The reversal of 643084864143 is 341468480346.

It is not a de Polignac number, because 643084864143 - 2² = 643084864139 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643084864153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 206871 + ... + 1152807.

It is an arithmetic number, because the mean of its divisors is an integer number (56415742320).

Almost surely, 2^643084864143 is an apocalyptic number.

643084864143 is a deficient number, since it is larger than the sum of its proper divisors (259567012977).

643084864143 is a wasteful number, since it uses less digits than its factorization.

643084864143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957886.

The product of its (nonzero) digits is 5308416, while the sum is 51.

The spelling of 643084864143 in words is "six hundred forty-three billion, eighty-four million, eight hundred sixty-four thousand, one hundred forty-three".