66688888888998 has 12 divisors (see below), whose sum is σ = 144492592592868. Its totient is φ = 22229629629660.

The previous prime is 66688888888969. The next prime is 66688888889011. The reversal of 66688888888998 is 89988888888666.

It is a self number, because there is not a number n which added to its sum of digits gives 66688888888998.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1852469135788 + ... + 1852469135823.

It is an arithmetic number, because the mean of its divisors is an integer number (12041049382739).

Almost surely, 2^{66688888888998} is an apocalyptic number.

66688888888998 is an abundant number, since it is smaller than the sum of its proper divisors (77803703703870).

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

66688888888998 is a wasteful number, since it uses less digits than its factorization.

66688888888998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3704938271619 (or 3704938271616 counting only the distinct ones).

The product of its digits is 2348273369088, while the sum is 108.

The spelling of 66688888888998 in words is "sixty-six trillion, six hundred eighty-eight billion, eight hundred eighty-eight million, eight hundred eighty-eight thousand, nine hundred ninety-eight".