166123116311 has 4 divisors (see below), whose sum is σ = 166213846224. Its totient is φ = 166032386400.

The previous prime is 166123116253. The next prime is 166123116317. The reversal of 166123116311 is 113611321661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 113611321661 = 47 ⋅2417262163.

It is a cyclic number.

It is not a de Polignac number, because 166123116311 - 2¹⁸ = 166122854167 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 (166123116317) 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, 45362210 + ... + 45365871.

It is an arithmetic number, because the mean of its divisors is an integer number (41553461556).

Almost surely, 2^166123116311 is an apocalyptic number.

166123116311 is a deficient number, since it is larger than the sum of its proper divisors (90729913).

166123116311 is an equidigital number, since it uses as much as digits as its factorization.

166123116311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90729912.

The product of its digits is 3888, while the sum is 32.

Adding to 166123116311 its reverse (113611321661), we get a palindrome (279734437972).

The spelling of 166123116311 in words is "one hundred sixty-six billion, one hundred twenty-three million, one hundred sixteen thousand, three hundred eleven".