78685255863 has 48 divisors (see below), whose sum is σ = 120643461120. Its totient is φ = 49316522112.

The previous prime is 78685255849. The next prime is 78685255867. The reversal of 78685255863 is 36855258687.

78685255863 is a `hidden beast` number, since 78 + 6 + 8 + 5 + 2 + 558 + 6 + 3 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-78685255863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78685255863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78685255867) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3635931 + ... + 3657507.

It is an arithmetic number, because the mean of its divisors is an integer number (2513405440).

Almost surely, 2^78685255863 is an apocalyptic number.

78685255863 is a deficient number, since it is larger than the sum of its proper divisors (41958205257).

78685255863 is a wasteful number, since it uses less digits than its factorization.

78685255863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21908 (or 21905 counting only the distinct ones).

The product of its digits is 96768000, while the sum is 63.

The spelling of 78685255863 in words is "seventy-eight billion, six hundred eighty-five million, two hundred fifty-five thousand, eight hundred sixty-three".