66103055181 has 10 divisors (see below), whose sum is σ = 98746539342. Its totient is φ = 44068703400.

The previous prime is 66103055147. The next prime is 66103055191. The reversal of 66103055181 is 18155030166.

66103055181 is a `hidden beast` number, since 6 + 610 + 30 + 5 + 5 + 1 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 34459981956 + 31643073225 = 185634^2 + 177885^2 .

It is not a de Polignac number, because 66103055181 - 2²⁷ = 65968837453 is a prime.

It is a super-2 number, since 2×66103055181² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66103055191) by changing a digit.

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 9 ways as a sum of consecutive naturals, for example, 408043470 + ... + 408043631.

Almost surely, 2^66103055181 is an apocalyptic number.

It is an amenable number.

66103055181 is a deficient number, since it is larger than the sum of its proper divisors (32643484161).

66103055181 is an equidigital number, since it uses as much as digits as its factorization.

66103055181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816087113 (or 816087104 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The spelling of 66103055181 in words is "sixty-six billion, one hundred three million, fifty-five thousand, one hundred eighty-one".