66806800008 has 64 divisors (see below), whose sum is σ = 180082647360. Its totient is φ = 20531003136.

The previous prime is 66806799991. The next prime is 66806800043. The reversal of 66806800008 is 80000860866.

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, 128566 + ... + 387482.

It is an arithmetic number, because the mean of its divisors is an integer number (2813791365).

Almost surely, 2^66806800008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66806800008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90041323680).

66806800008 is an abundant number, since it is smaller than the sum of its proper divisors (113275847352).

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

66806800008 is a wasteful number, since it uses less digits than its factorization.

66806800008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259766 (or 259762 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 42.

The spelling of 66806800008 in words is "sixty-six billion, eight hundred six million, eight hundred thousand, eight".