66556006611 has 32 divisors (see below), whose sum is σ = 91186433280. Its totient is φ = 43165799424.

The previous prime is 66556006603. The next prime is 66556006639. The reversal of 66556006611 is 11660065566.

It is not a de Polignac number, because 66556006611 - 2³ = 66556006603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66556006691) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 20087691 + ... + 20091003.

It is an arithmetic number, because the mean of its divisors is an integer number (2849576040).

Almost surely, 2^66556006611 is an apocalyptic number.

66556006611 is a deficient number, since it is larger than the sum of its proper divisors (24630426669).

66556006611 is a wasteful number, since it uses less digits than its factorization.

66556006611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4595.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 66556006611 in words is "sixty-six billion, five hundred fifty-six million, six thousand, six hundred eleven".