643685274859 has 8 divisors (see below), whose sum is σ = 739160124480. Its totient is φ = 554370093000.

The previous prime is 643685274853. The next prime is 643685274887. The reversal of 643685274859 is 958472586346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 643685274859 - 2¹⁹ = 643684750571 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 643685274794 and 643685274803.

It is not an unprimeable number, because it can be changed into a prime (643685274853) 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 7 ways as a sum of consecutive naturals, for example, 1539916717 + ... + 1539917134.

It is an arithmetic number, because the mean of its divisors is an integer number (92395015560).

Almost surely, 2^643685274859 is an apocalyptic number.

643685274859 is a deficient number, since it is larger than the sum of its proper divisors (95474849621).

643685274859 is a wasteful number, since it uses less digits than its factorization.

643685274859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3079833881.

The product of its digits is 348364800, while the sum is 67.

The spelling of 643685274859 in words is "six hundred forty-three billion, six hundred eighty-five million, two hundred seventy-four thousand, eight hundred fifty-nine".