66688822778888 has 36 divisors (see below), whose sum is σ = 126938635182765. Its totient is φ = 32845971378528.

The previous prime is 66688822778843. The next prime is 66688822778947. The reversal of 66688822778888 is 88887722888666.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

66688822778888 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 64110479637604 + 2578343141284 = 8006902^2 + 1605722^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=5774462.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66688822778797 and 66688822778806.

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 8 ways as a sum of consecutive naturals, for example, 1547534270 + ... + 1547577362.

Almost surely, 2^{66688822778888} is an apocalyptic number.

It is an amenable number.

66688822778888 is a deficient number, since it is larger than the sum of its proper divisors (60249812403877).

66688822778888 is an frugal number, since it uses more digits than its factorization.

66688822778888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86326 (or 43162 counting only the distinct ones).

The product of its digits is 88785027072, while the sum is 92.

The spelling of 66688822778888 in words is "sixty-six trillion, six hundred eighty-eight billion, eight hundred twenty-two million, seven hundred seventy-eight thousand, eight hundred eighty-eight".