66216552188826 has 32 divisors (see below), whose sum is σ = 142620706726848. Its totient is φ = 20374260825600.

The previous prime is 66216552188797. The next prime is 66216552188837. The reversal of 66216552188826 is 62888125561266.

66216552188826 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 28393545 + ... + 30637011.

It is an arithmetic number, because the mean of its divisors is an integer number (4456897085214).

Almost surely, 2^{66216552188826} is an apocalyptic number.

66216552188826 is an abundant number, since it is smaller than the sum of its proper divisors (76404154538022).

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

66216552188826 is a wasteful number, since it uses less digits than its factorization.

66216552188826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2621886.

The product of its digits is 132710400, while the sum is 66.

The spelling of 66216552188826 in words is "sixty-six trillion, two hundred sixteen billion, five hundred fifty-two million, one hundred eighty-eight thousand, eight hundred twenty-six".