643914585423 has 96 divisors (see below), whose sum is σ = 995652403200. Its totient is φ = 415706709600.

The previous prime is 643914585397. The next prime is 643914585427. The reversal of 643914585423 is 324585419346.

It is a happy number.

643914585423 is a `hidden beast` number, since 6 + 4 + 3 + 9 + 14 + 585 + 42 + 3 = 666.

It is not a de Polignac number, because 643914585423 - 2⁶ = 643914585359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 643914585423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643914585427) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 287589138 + ... + 287591376.

It is an arithmetic number, because the mean of its divisors is an integer number (10371379200).

Almost surely, 2^643914585423 is an apocalyptic number.

643914585423 is a deficient number, since it is larger than the sum of its proper divisors (351737817777).

643914585423 is a wasteful number, since it uses less digits than its factorization.

643914585423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2615 (or 2603 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 54.

The spelling of 643914585423 in words is "six hundred forty-three billion, nine hundred fourteen million, five hundred eighty-five thousand, four hundred twenty-three".