78668886687 has 4 divisors (see below), whose sum is σ = 104891848920. Its totient is φ = 52445924456.

The previous prime is 78668886679. The next prime is 78668886689.

78668886687 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78668886687 - 2³ = 78668886679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78668886689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13111481112 + ... + 13111481117.

It is an arithmetic number, because the mean of its divisors is an integer number (26222962230).

Almost surely, 2^78668886687 is an apocalyptic number.

78668886687 is a deficient number, since it is larger than the sum of its proper divisors (26222962233).

78668886687 is a wasteful number, since it uses less digits than its factorization.

78668886687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26222962232.

The product of its digits is 2080899072, while the sum is 78.

It can be divided in two parts, 78668 and 886687, that added together give a triangular number (965355 = T₁₃₈₉).

The spelling of 78668886687 in words is "seventy-eight billion, six hundred sixty-eight million, eight hundred eighty-six thousand, six hundred eighty-seven".