671866837 has 4 divisors (see below), whose sum is σ = 678389920. Its totient is φ = 665343756.

The previous prime is 671866763. The next prime is 671866859. The reversal of 671866837 is 738668176.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 671866837 - 2⁷ = 671866709 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 (671866337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3261387 + ... + 3261592.

It is an arithmetic number, because the mean of its divisors is an integer number (169597480).

Almost surely, 2^671866837 is an apocalyptic number.

It is an amenable number.

671866837 is a deficient number, since it is larger than the sum of its proper divisors (6523083).

671866837 is a wasteful number, since it uses less digits than its factorization.

671866837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6523082.

The product of its digits is 2032128, while the sum is 52.

The square root of 671866837 is about 25920.3942292551. The cubic root of 671866837 is about 875.8459680140.

The spelling of 671866837 in words is "six hundred seventy-one million, eight hundred sixty-six thousand, eight hundred thirty-seven".