166610111 has 4 divisors (see below), whose sum is σ = 169753752. Its totient is φ = 163466472.

The previous prime is 166610099. The next prime is 166610113. The reversal of 166610111 is 111016661.

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 166610111 - 2¹⁰ = 166609087 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 (166610113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1571741 + ... + 1571846.

It is an arithmetic number, because the mean of its divisors is an integer number (42438438).

Almost surely, 2^166610111 is an apocalyptic number.

166610111 is a deficient number, since it is larger than the sum of its proper divisors (3143641).

166610111 is an equidigital number, since it uses as much as digits as its factorization.

166610111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3143640.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 166610111 is about 12907.7539099566. The cubic root of 166610111 is about 550.2589535413.

Adding to 166610111 its reverse (111016661), we get a palindrome (277626772).

The spelling of 166610111 in words is "one hundred sixty-six million, six hundred ten thousand, one hundred eleven".