785680543817 has 4 divisors (see below), whose sum is σ = 846117508740. Its totient is φ = 725243578896.

The previous prime is 785680543777. The next prime is 785680543829. The reversal of 785680543817 is 718345086587.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 182975195536 + 602705348281 = 427756^2 + 776341^2 .

It is a cyclic number.

It is not a de Polignac number, because 785680543817 - 2⁸ = 785680543561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 785680543817.

It is not an unprimeable number, because it can be changed into a prime (785682543817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30218482442 + ... + 30218482467.

It is an arithmetic number, because the mean of its divisors is an integer number (211529377185).

Almost surely, 2^785680543817 is an apocalyptic number.

It is an amenable number.

785680543817 is a deficient number, since it is larger than the sum of its proper divisors (60436964923).

785680543817 is a wasteful number, since it uses less digits than its factorization.

785680543817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60436964922.

The product of its (nonzero) digits is 45158400, while the sum is 62.

The spelling of 785680543817 in words is "seven hundred eighty-five billion, six hundred eighty million, five hundred forty-three thousand, eight hundred seventeen".