66000000008 has 16 divisors (see below), whose sum is σ = 127094595180. Its totient is φ = 32108107968.

The previous prime is 65999999999. The next prime is 66000000013. The reversal of 66000000008 is 80000000066.

It can be written as a sum of positive squares in 2 ways, for example, as 62479001764 + 3520998244 = 249958^2 + 59338^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111486191 + ... + 111486782.

Almost surely, 2^66000000008 is an apocalyptic number.

It is an amenable number.

66000000008 is a deficient number, since it is larger than the sum of its proper divisors (61094595172).

66000000008 is a wasteful number, since it uses less digits than its factorization.

66000000008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222973016 (or 222973012 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The spelling of 66000000008 in words is "sixty-six billion, eight", and thus it is an aban number and an uban number.