166117711 has 4 divisors (see below), whose sum is σ = 166342032. Its totient is φ = 165893392.

The previous prime is 166117697. The next prime is 166117717. The reversal of 166117711 is 117711661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 117711661 = 9689 ⋅12149.

It is a cyclic number.

It is not a de Polignac number, because 166117711 - 2¹⁹ = 165593423 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 (166117717) 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, 111046 + ... + 112531.

It is an arithmetic number, because the mean of its divisors is an integer number (41585508).

Almost surely, 2^166117711 is an apocalyptic number.

166117711 is a deficient number, since it is larger than the sum of its proper divisors (224321).

166117711 is an equidigital number, since it uses as much as digits as its factorization.

166117711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224320.

The product of its digits is 1764, while the sum is 31.

The square root of 166117711 is about 12888.6659899308. The cubic root of 166117711 is about 549.7163396789.

The spelling of 166117711 in words is "one hundred sixty-six million, one hundred seventeen thousand, seven hundred eleven".