68686668140 has 24 divisors (see below), whose sum is σ = 144774272832. Its totient is φ = 27373282560.

The previous prime is 68686668109. The next prime is 68686668191. The reversal of 68686668140 is 4186668686.

It is a self number, because there is not a number n which added to its sum of digits gives 68686668140.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6330989 + ... + 6341828.

It is an arithmetic number, because the mean of its divisors is an integer number (6032261368).

Almost surely, 2^68686668140 is an apocalyptic number.

It is an amenable number.

68686668140 is an abundant number, since it is smaller than the sum of its proper divisors (76087604692).

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

68686668140 is a wasteful number, since it uses less digits than its factorization.

68686668140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12673097 (or 12673095 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 59.

The spelling of 68686668140 in words is "sixty-eight billion, six hundred eighty-six million, six hundred sixty-eight thousand, one hundred forty".