66888989886 has 32 divisors (see below), whose sum is σ = 134206450560. Its totient is φ = 22225006496.

The previous prime is 66888989801. The next prime is 66888989899. The reversal of 66888989886 is 68898988866.

It is a junction number, because it is equal to n+sod(n) for n = 66888989799 and 66888989808.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3275620 + ... + 3295976.

It is an arithmetic number, because the mean of its divisors is an integer number (4193951580).

Almost surely, 2^66888989886 is an apocalyptic number.

66888989886 is an abundant number, since it is smaller than the sum of its proper divisors (67317460674).

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

66888989886 is a wasteful number, since it uses less digits than its factorization.

66888989886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22088.

The product of its digits is 4586471424, while the sum is 84.

The spelling of 66888989886 in words is "sixty-six billion, eight hundred eighty-eight million, nine hundred eighty-nine thousand, eight hundred eighty-six".