166109687 has 16 divisors (see below), whose sum is σ = 178036992. Its totient is φ = 154690560.

The previous prime is 166109681. The next prime is 166109707. The reversal of 166109687 is 786901661.

It is a cyclic number.

It is not a de Polignac number, because 166109687 - 2²⁰ = 165061111 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 (166109681) 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 15 ways as a sum of consecutive naturals, for example, 110513 + ... + 112005.

It is an arithmetic number, because the mean of its divisors is an integer number (11127312).

Almost surely, 2^166109687 is an apocalyptic number.

166109687 is a deficient number, since it is larger than the sum of its proper divisors (11927305).

166109687 is a wasteful number, since it uses less digits than its factorization.

166109687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 166109687 is about 12888.3547049265. The cubic root of 166109687 is about 549.7074885357.

The spelling of 166109687 in words is "one hundred sixty-six million, one hundred nine thousand, six hundred eighty-seven".