78817642585847 has 8 divisors (see below), whose sum is σ = 87982484747520. Its totient is φ = 69986067411960.

The previous prime is 78817642585823. The next prime is 78817642585849. The reversal of 78817642585847 is 74858524671887.

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 78817642585847 - 2⁶ = 78817642585783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78817642585849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83316746447 + ... + 83316747392.

It is an arithmetic number, because the mean of its divisors is an integer number (10997810593440).

Almost surely, 2^{78817642585847} is an apocalyptic number.

78817642585847 is a deficient number, since it is larger than the sum of its proper divisors (9164842161673).

78817642585847 is a wasteful number, since it uses less digits than its factorization.

78817642585847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166633493893.

The product of its digits is 6743654400, while the sum is 80.

The spelling of 78817642585847 in words is "seventy-eight trillion, eight hundred seventeen billion, six hundred forty-two million, five hundred eighty-five thousand, eight hundred forty-seven".