643104672070736 has 40 divisors (see below), whose sum is σ = 1258087804727040. Its totient is φ = 318451793872896.

The previous prime is 643104672070717. The next prime is 643104672070753. The reversal of 643104672070736 is 637070276401346.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 466260446 + ... + 467637693.

It is an arithmetic number, because the mean of its divisors is an integer number (31452195118176).

Almost surely, 2^{643104672070736} is an apocalyptic number.

It is an amenable number.

643104672070736 is a deficient number, since it is larger than the sum of its proper divisors (614983132656304).

643104672070736 is a wasteful number, since it uses less digits than its factorization.

643104672070736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933898563 (or 933898557 counting only the distinct ones).

The product of its (nonzero) digits is 21337344, while the sum is 56.

The spelling of 643104672070736 in words is "six hundred forty-three trillion, one hundred four billion, six hundred seventy-two million, seventy thousand, seven hundred thirty-six".