671566201 has 8 divisors (see below), whose sum is σ = 681252584. Its totient is φ = 661893120.

The previous prime is 671566193. The next prime is 671566219. The reversal of 671566201 is 102665176.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 173606976 + 497959225 = 13176^2 + 22315^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 671566201 - 2³ = 671566193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671566501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144961 + ... + 149521.

It is an arithmetic number, because the mean of its divisors is an integer number (85156573).

Almost surely, 2^671566201 is an apocalyptic number.

It is an amenable number.

671566201 is a deficient number, since it is larger than the sum of its proper divisors (9686383).

671566201 is a wasteful number, since it uses less digits than its factorization.

671566201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6651.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 671566201 is about 25914.5943630225. The cubic root of 671566201 is about 875.7153121073.

The spelling of 671566201 in words is "six hundred seventy-one million, five hundred sixty-six thousand, two hundred one".