166139171 has 6 divisors (see below), whose sum is σ = 182615916. Its totient is φ = 151035500.

The previous prime is 166139123. The next prime is 166139201. The reversal of 166139171 is 171931661.

166139171 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 166139171 - 2⁶ = 166139107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166139101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 686405 + ... + 686646.

It is an arithmetic number, because the mean of its divisors is an integer number (30435986).

Almost surely, 2^166139171 is an apocalyptic number.

166139171 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

166139171 is a deficient number, since it is larger than the sum of its proper divisors (16476745).

166139171 is a wasteful number, since it uses less digits than its factorization.

166139171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373073 (or 1373062 counting only the distinct ones).

The product of its digits is 6804, while the sum is 35.

The square root of 166139171 is about 12889.4984774428. The cubic root of 166139171 is about 549.7400104535.

The spelling of 166139171 in words is "one hundred sixty-six million, one hundred thirty-nine thousand, one hundred seventy-one".