166031161 has 4 divisors (see below), whose sum is σ = 166192000. Its totient is φ = 165870324.

The previous prime is 166031141. The next prime is 166031171. The reversal of 166031161 is 161130661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 161130661 = 1901 ⋅84761.

It is a cyclic number.

It is not a de Polignac number, because 166031161 - 2²⁷ = 31813433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166031141) 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, 78861 + ... + 80938.

It is an arithmetic number, because the mean of its divisors is an integer number (41548000).

Almost surely, 2^166031161 is an apocalyptic number.

It is an amenable number.

166031161 is a deficient number, since it is larger than the sum of its proper divisors (160839).

166031161 is a wasteful number, since it uses less digits than its factorization.

166031161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160838.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 166031161 is about 12885.3079513064. The cubic root of 166031161 is about 549.6208527412.

The spelling of 166031161 in words is "one hundred sixty-six million, thirty-one thousand, one hundred sixty-one".