78861216887 has 12 divisors (see below), whose sum is σ = 83808730656. Its totient is φ = 74190654720.

The previous prime is 78861216877. The next prime is 78861216893.

78861216887 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 78861216887 - 2³⁰ = 77787475063 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 (78861216877) 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, 634562 + ... + 748592.

It is an arithmetic number, because the mean of its divisors is an integer number (6984060888).

Almost surely, 2^78861216887 is an apocalyptic number.

78861216887 is a deficient number, since it is larger than the sum of its proper divisors (4947513769).

78861216887 is a wasteful number, since it uses less digits than its factorization.

78861216887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116458 (or 116441 counting only the distinct ones).

The product of its digits is 14450688, while the sum is 62.

The spelling of 78861216887 in words is "seventy-eight billion, eight hundred sixty-one million, two hundred sixteen thousand, eight hundred eighty-seven".