66611066555 has 8 divisors (see below), whose sum is σ = 87199941744. Its totient is φ = 48444412000.

The previous prime is 66611066551. The next prime is 66611066563. The reversal of 66611066555 is 55566011666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66611066555 - 2² = 66611066551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66611066551) 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 7 ways as a sum of consecutive naturals, for example, 605555096 + ... + 605555205.

It is an arithmetic number, because the mean of its divisors is an integer number (10899992718).

Almost surely, 2^66611066555 is an apocalyptic number.

66611066555 is a deficient number, since it is larger than the sum of its proper divisors (20588875189).

66611066555 is a wasteful number, since it uses less digits than its factorization.

66611066555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211110317.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 66611066555 in words is "sixty-six billion, six hundred eleven million, sixty-six thousand, five hundred fifty-five".