166671871 has 4 divisors (see below), whose sum is σ = 167888592. Its totient is φ = 165455152.

The previous prime is 166671839. The next prime is 166671887. The reversal of 166671871 is 178176661.

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

It is a cyclic number.

It is not a de Polignac number, because 166671871 - 2⁵ = 166671839 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 (166678871) 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, 608155 + ... + 608428.

It is an arithmetic number, because the mean of its divisors is an integer number (41972148).

Almost surely, 2^166671871 is an apocalyptic number.

166671871 is a deficient number, since it is larger than the sum of its proper divisors (1216721).

166671871 is a wasteful number, since it uses less digits than its factorization.

166671871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216720.

The product of its digits is 84672, while the sum is 43.

The square root of 166671871 is about 12910.1460487479. The cubic root of 166671871 is about 550.3269361995.

It can be divided in two parts, 1666 and 71871, that added together give a palindrome (73537).

The spelling of 166671871 in words is "one hundred sixty-six million, six hundred seventy-one thousand, eight hundred seventy-one".