78655655687 has 12 divisors (see below), whose sum is σ = 91509059016. Its totient is φ = 67410539280.

The previous prime is 78655655653. The next prime is 78655655717.

78655655687 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 78655655687 - 2¹⁰ = 78655654663 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 (78655655627) 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, 302153 + ... + 498605.

It is an arithmetic number, because the mean of its divisors is an integer number (7625754918).

Almost surely, 2^78655655687 is an apocalyptic number.

78655655687 is a deficient number, since it is larger than the sum of its proper divisors (12853403329).

78655655687 is a wasteful number, since it uses less digits than its factorization.

78655655687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204638 (or 204631 counting only the distinct ones).

The product of its digits is 423360000, while the sum is 68.

The spelling of 78655655687 in words is "seventy-eight billion, six hundred fifty-five million, six hundred fifty-five thousand, six hundred eighty-seven".