78646866864687 has 12 divisors (see below), whose sum is σ = 123928396271784. Its totient is φ = 47664767796720.

The previous prime is 78646866864653. The next prime is 78646866864719.

78646866864687 is a `hidden beast` number, since 7 + 8 + 6 + 4 + 6 + 8 + 66 + 86 + 468 + 7 = 666.

78646866864687 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 78646866864687 - 2⁶ = 78646866864623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78646866864597 and 78646866864606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78646866864607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 397206398208 + ... + 397206398405.

It is an arithmetic number, because the mean of its divisors is an integer number (10327366355982).

Almost surely, 2^{78646866864687} is an apocalyptic number.

78646866864687 is a deficient number, since it is larger than the sum of its proper divisors (45281529407097).

78646866864687 is a wasteful number, since it uses less digits than its factorization.

78646866864687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794412796630 (or 794412796627 counting only the distinct ones).

The product of its digits is 149824733184, while the sum is 90.

The spelling of 78646866864687 in words is "seventy-eight trillion, six hundred forty-six billion, eight hundred sixty-six million, eight hundred sixty-four thousand, six hundred eighty-seven".