16661166117 has 4 divisors (see below), whose sum is σ = 22214888160. Its totient is φ = 11107444076.

The previous prime is 16661166113. The next prime is 16661166161. The reversal of 16661166117 is 71166116661.

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 16661166117 - 2² = 16661166113 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16661166113) 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, 2776861017 + ... + 2776861022.

It is an arithmetic number, because the mean of its divisors is an integer number (5553722040).

Almost surely, 2^16661166117 is an apocalyptic number.

It is an amenable number.

16661166117 is a deficient number, since it is larger than the sum of its proper divisors (5553722043).

16661166117 is an equidigital number, since it uses as much as digits as its factorization.

16661166117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5553722042.

The product of its digits is 54432, while the sum is 42.

The spelling of 16661166117 in words is "sixteen billion, six hundred sixty-one million, one hundred sixty-six thousand, one hundred seventeen".