66556105107 has 4 divisors (see below), whose sum is σ = 88741473480. Its totient is φ = 44370736736.

The previous prime is 66556105093. The next prime is 66556105171. The reversal of 66556105107 is 70150165566.

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

It is a cyclic number.

It is not a de Polignac number, because 66556105107 - 2⁸ = 66556104851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66556109107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11092684182 + ... + 11092684187.

It is an arithmetic number, because the mean of its divisors is an integer number (22185368370).

Almost surely, 2^66556105107 is an apocalyptic number.

66556105107 is a deficient number, since it is larger than the sum of its proper divisors (22185368373).

66556105107 is a wasteful number, since it uses less digits than its factorization.

66556105107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22185368372.

The product of its (nonzero) digits is 189000, while the sum is 42.

The spelling of 66556105107 in words is "sixty-six billion, five hundred fifty-six million, one hundred five thousand, one hundred seven".