66066111550109 has 4 divisors (see below), whose sum is σ = 72072121691040. Its totient is φ = 60060101409180.

The previous prime is 66066111550097. The next prime is 66066111550211. The reversal of 66066111550109 is 90105511166066.

66066111550109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66066111550109 - 2¹⁶ = 66066111484573 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66066111559109) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3003005070449 + ... + 3003005070470.

It is an arithmetic number, because the mean of its divisors is an integer number (18018030422760).

Almost surely, 2^{66066111550109} is an apocalyptic number.

It is an amenable number.

66066111550109 is a deficient number, since it is larger than the sum of its proper divisors (6006010140931).

66066111550109 is a wasteful number, since it uses less digits than its factorization.

66066111550109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6006010140930.

The product of its (nonzero) digits is 291600, while the sum is 47.

The spelling of 66066111550109 in words is "sixty-six trillion, sixty-six billion, one hundred eleven million, five hundred fifty thousand, one hundred nine".