66115155105 has 12 divisors (see below), whose sum is σ = 114599602260. Its totient is φ = 35261416032.

The previous prime is 66115155097. The next prime is 66115155151. The reversal of 66115155105 is 50155151166.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 30967904529 + 35147250576 = 175977^2 + 187476^2 .

It is not a de Polignac number, because 66115155105 - 2³ = 66115155097 is a prime.

It is a super-2 number, since 2×66115155105² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66115155105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 734612790 + ... + 734612879.

It is an arithmetic number, because the mean of its divisors is an integer number (9549966855).

Almost surely, 2^66115155105 is an apocalyptic number.

It is an amenable number.

66115155105 is a deficient number, since it is larger than the sum of its proper divisors (48484447155).

66115155105 is a wasteful number, since it uses less digits than its factorization.

66115155105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1469225680 (or 1469225677 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 66115155105 in words is "sixty-six billion, one hundred fifteen million, one hundred fifty-five thousand, one hundred five".