68666866686 has 72 divisors (see below), whose sum is σ = 165033949080. Its totient is φ = 20617169760.

The previous prime is 68666866673. The next prime is 68666866703.

68666866686 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 92781 + ... + 382023.

Almost surely, 2^68666866686 is an apocalyptic number.

68666866686 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 68666866686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82516974540).

68666866686 is an abundant number, since it is smaller than the sum of its proper divisors (96367082394).

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

68666866686 is a wasteful number, since it uses less digits than its factorization.

68666866686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289382 (or 289368 counting only the distinct ones).

The product of its digits is 859963392, while the sum is 72.

The spelling of 68666866686 in words is "sixty-eight billion, six hundred sixty-six million, eight hundred sixty-six thousand, six hundred eighty-six".