671906166 has 8 divisors (see below), whose sum is σ = 1343812344. Its totient is φ = 223968720.

The previous prime is 671906159. The next prime is 671906171. The reversal of 671906166 is 661609176.

It is a sphenic number, since it is the product of 3 distinct primes.

671906166 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55992175 + ... + 55992186.

It is an arithmetic number, because the mean of its divisors is an integer number (167976543).

Almost surely, 2^671906166 is an apocalyptic number.

671906166 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671906166 is a wasteful number, since it uses less digits than its factorization.

671906166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111984366.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 671906166 is about 25921.1528678799. The cubic root of 671906166 is about 875.8630574490.

The spelling of 671906166 in words is "six hundred seventy-one million, nine hundred six thousand, one hundred sixty-six".