78656606847 has 128 divisors (see below), whose sum is σ = 152168038400. Its totient is φ = 38993125248.

The previous prime is 78656606839. The next prime is 78656606863. The reversal of 78656606847 is 74860665687.

78656606847 is a `hidden beast` number, since 7 + 8 + 6 + 566 + 0 + 68 + 4 + 7 = 666.

It is not a de Polignac number, because 78656606847 - 2³ = 78656606839 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78656606827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5922108 + ... + 5935374.

It is an arithmetic number, because the mean of its divisors is an integer number (1188812800).

Almost surely, 2^78656606847 is an apocalyptic number.

78656606847 is a deficient number, since it is larger than the sum of its proper divisors (73511431553).

78656606847 is a wasteful number, since it uses less digits than its factorization.

78656606847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13442 (or 13436 counting only the distinct ones).

The product of its (nonzero) digits is 81285120, while the sum is 63.

The spelling of 78656606847 in words is "seventy-eight billion, six hundred fifty-six million, six hundred six thousand, eight hundred forty-seven".