1666109927197 has 8 divisors (see below), whose sum is σ = 1666568937600. Its totient is φ = 1665650995680.

The previous prime is 1666109927191. The next prime is 1666109927243. The reversal of 1666109927197 is 7917299016661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1666109927197 - 2²³ = 1666101538589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666109927191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75504988 + ... + 75527050.

It is an arithmetic number, because the mean of its divisors is an integer number (208321117200).

Almost surely, 2^{1666109927197} is an apocalyptic number.

It is an amenable number.

1666109927197 is a deficient number, since it is larger than the sum of its proper divisors (459010403).

1666109927197 is an equidigital number, since it uses as much as digits as its factorization.

1666109927197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39443.

The product of its (nonzero) digits is 15431472, while the sum is 64.

The spelling of 1666109927197 in words is "one trillion, six hundred sixty-six billion, one hundred nine million, nine hundred twenty-seven thousand, one hundred ninety-seven".