856708007643 has 16 divisors (see below), whose sum is σ = 1293144164640. Its totient is φ = 560362469472.

The previous prime is 856708007633. The next prime is 856708007711. The reversal of 856708007643 is 346700807658.

856708007643 is a `hidden beast` number, since 8 + 567 + 0 + 8 + 0 + 0 + 76 + 4 + 3 = 666.

It is not a de Polignac number, because 856708007643 - 2⁸ = 856708007387 is a prime.

It is a super-2 number, since 2×856708007643² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 856708007643.

It is not an unprimeable number, because it can be changed into a prime (856708007633) 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, 299337496 + ... + 299340357.

It is an arithmetic number, because the mean of its divisors is an integer number (80821510290).

Almost surely, 2^856708007643 is an apocalyptic number.

856708007643 is a deficient number, since it is larger than the sum of its proper divisors (436436156997).

856708007643 is a wasteful number, since it uses less digits than its factorization.

856708007643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598677915 (or 598677909 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 54.

The spelling of 856708007643 in words is "eight hundred fifty-six billion, seven hundred eight million, seven thousand, six hundred forty-three".