66605011105 has 4 divisors (see below), whose sum is σ = 79926013332. Its totient is φ = 53284008880.

The previous prime is 66605011097. The next prime is 66605011111. The reversal of 66605011105 is 50111050666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12043526049 + 54561485056 = 109743^2 + 233584^2 .

It is not a de Polignac number, because 66605011105 - 2³ = 66605011097 is a prime.

It is a Duffinian 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, 6660501106 + ... + 6660501115.

It is an arithmetic number, because the mean of its divisors is an integer number (19981503333).

Almost surely, 2^66605011105 is an apocalyptic number.

It is an amenable number.

66605011105 is a deficient number, since it is larger than the sum of its proper divisors (13321002227).

66605011105 is a wasteful number, since it uses less digits than its factorization.

66605011105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13321002226.

The product of its (nonzero) digits is 5400, while the sum is 31.

The spelling of 66605011105 in words is "sixty-six billion, six hundred five million, eleven thousand, one hundred five".