166691169 has 16 divisors (see below), whose sum is σ = 247587840. Its totient is φ = 110840400.

The previous prime is 166691153. The next prime is 166691191. The reversal of 166691169 is 961196661.

166691169 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166691169 - 2⁴ = 166691153 is a prime.

It is a super-2 number, since 2×166691169² = 55571891645173122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (166691149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2944 + ... + 18494.

It is an arithmetic number, because the mean of its divisors is an integer number (15474240).

Almost surely, 2^166691169 is an apocalyptic number.

It is an amenable number.

166691169 is a deficient number, since it is larger than the sum of its proper divisors (80896671).

166691169 is a wasteful number, since it uses less digits than its factorization.

166691169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15957 (or 15951 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 166691169 is about 12910.8934237720. The cubic root of 166691169 is about 550.3481751350.

The spelling of 166691169 in words is "one hundred sixty-six million, six hundred ninety-one thousand, one hundred sixty-nine".