78886688886666 has 48 divisors (see below), whose sum is σ = 175018354992000. Its totient is φ = 25668177562944.

The previous prime is 78886688886637. The next prime is 78886688886679. The reversal of 78886688886666 is 66668888668887.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 122696091 + ... + 123337358.

It is an arithmetic number, because the mean of its divisors is an integer number (3646215729000).

Almost surely, 2^{78886688886666} is an apocalyptic number.

78886688886666 is an abundant number, since it is smaller than the sum of its proper divisors (96131666105334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78886688886666 is a wasteful number, since it uses less digits than its factorization.

78886688886666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246033883 (or 246033880 counting only the distinct ones).

The product of its digits is 684913065984, while the sum is 99.

The spelling of 78886688886666 in words is "seventy-eight trillion, eight hundred eighty-six billion, six hundred eighty-eight million, eight hundred eighty-six thousand, six hundred sixty-six".