78855918686 has 16 divisors (see below), whose sum is σ = 119086023264. Its totient is φ = 39160783584.

The previous prime is 78855918637. The next prime is 78855918689. The reversal of 78855918686 is 68681955887.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78855918689) 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 7 ways as a sum of consecutive naturals, for example, 735776 + ... + 836108.

It is an arithmetic number, because the mean of its divisors is an integer number (7442876454).

Almost surely, 2^78855918686 is an apocalyptic number.

78855918686 is a deficient number, since it is larger than the sum of its proper divisors (40230104578).

78855918686 is a wasteful number, since it uses less digits than its factorization.

78855918686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102995.

The product of its digits is 232243200, while the sum is 71.

The spelling of 78855918686 in words is "seventy-eight billion, eight hundred fifty-five million, nine hundred eighteen thousand, six hundred eighty-six".