66226807828 has 12 divisors (see below), whose sum is σ = 115990614292. Its totient is φ = 33086632320.

The previous prime is 66226807789. The next prime is 66226807847. The reversal of 66226807828 is 82870862266.

It can be written as a sum of positive squares in 2 ways, for example, as 60603607684 + 5623200144 = 246178^2 + 74988^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6687333 + ... + 6697228.

Almost surely, 2^66226807828 is an apocalyptic number.

It is an amenable number.

66226807828 is a deficient number, since it is larger than the sum of its proper divisors (49763806464).

66226807828 is a wasteful number, since it uses less digits than its factorization.

66226807828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13385802 (or 13385800 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 55.

The spelling of 66226807828 in words is "sixty-six billion, two hundred twenty-six million, eight hundred seven thousand, eight hundred twenty-eight".