671566 has 8 divisors (see below), whose sum is σ = 1151280. Its totient is φ = 287808.

The previous prime is 671557. The next prime is 671581. The reversal of 671566 is 665176.

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

It is a congruent number.

It is an unprimeable number.

671566 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23971 + ... + 23998.

It is an arithmetic number, because the mean of its divisors is an integer number (143910).

2⁶⁷¹⁵⁶⁶ is an apocalyptic number.

671566 is a deficient number, since it is larger than the sum of its proper divisors (479714).

671566 is a wasteful number, since it uses less digits than its factorization.

671566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47978.

The product of its digits is 7560, while the sum is 31.

The square root of 671566 is about 819.4913056281. The cubic root of 671566 is about 87.5715224740.

The spelling of 671566 in words is "six hundred seventy-one thousand, five hundred sixty-six".