166201671 has 4 divisors (see below), whose sum is σ = 221602232. Its totient is φ = 110801112.

The previous prime is 166201631. The next prime is 166201681. The reversal of 166201671 is 176102661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 166201671 - 2¹¹ = 166199623 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 (166201631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27700276 + ... + 27700281.

It is an arithmetic number, because the mean of its divisors is an integer number (55400558).

Almost surely, 2^166201671 is an apocalyptic number.

166201671 is a deficient number, since it is larger than the sum of its proper divisors (55400561).

166201671 is an equidigital number, since it uses as much as digits as its factorization.

166201671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55400560.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 166201671 is about 12891.9227037708. The cubic root of 166201671 is about 549.8089374919.

The spelling of 166201671 in words is "one hundred sixty-six million, two hundred one thousand, six hundred seventy-one".