78655255687 has 4 divisors (see below), whose sum is σ = 78660725080. Its totient is φ = 78649786296.

The previous prime is 78655255667. The next prime is 78655255691.

78655255687 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 78655255687 - 2¹¹ = 78655253639 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 (78655255667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2713068 + ... + 2741905.

It is an arithmetic number, because the mean of its divisors is an integer number (19665181270).

Almost surely, 2^78655255687 is an apocalyptic number.

78655255687 is a deficient number, since it is larger than the sum of its proper divisors (5469393).

78655255687 is a wasteful number, since it uses less digits than its factorization.

78655255687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5469392.

The product of its digits is 141120000, while the sum is 64.

The spelling of 78655255687 in words is "seventy-eight billion, six hundred fifty-five million, two hundred fifty-five thousand, six hundred eighty-seven".