78643555534687 has 16 divisors (see below), whose sum is σ = 92397657371040. Its totient is φ = 65990857420800.

The previous prime is 78643555534673. The next prime is 78643555534693.

78643555534687 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-78643555534687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78643555534487) 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, 13023762 + ... + 18080527.

It is an arithmetic number, because the mean of its divisors is an integer number (5774853585690).

Almost surely, 2^{78643555534687} is an apocalyptic number.

78643555534687 is a deficient number, since it is larger than the sum of its proper divisors (13754101836353).

78643555534687 is a wasteful number, since it uses less digits than its factorization.

78643555534687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31121994.

The product of its digits is 10160640000, while the sum is 76.

The spelling of 78643555534687 in words is "seventy-eight trillion, six hundred forty-three billion, five hundred fifty-five million, five hundred thirty-four thousand, six hundred eighty-seven".