1578680856817 has 16 divisors (see below), whose sum is σ = 1606381983360. Its totient is φ = 1551235795200.

The previous prime is 1578680856803. The next prime is 1578680856839. The reversal of 1578680856817 is 7186580868751.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1578680856817 - 2¹¹ = 1578680854769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1578680856877) 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, 22139692 + ... + 22210882.

It is an arithmetic number, because the mean of its divisors is an integer number (100398873960).

Almost surely, 2^{1578680856817} is an apocalyptic number.

It is an amenable number.

1578680856817 is a deficient number, since it is larger than the sum of its proper divisors (27701126543).

1578680856817 is a wasteful number, since it uses less digits than its factorization.

1578680856817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72984.

The product of its (nonzero) digits is 180633600, while the sum is 70.

The spelling of 1578680856817 in words is "one trillion, five hundred seventy-eight billion, six hundred eighty million, eight hundred fifty-six thousand, eight hundred seventeen".