671866443 has 24 divisors (see below), whose sum is σ = 1002933360. Its totient is φ = 433137600.

The previous prime is 671866427. The next prime is 671866477. The reversal of 671866443 is 344668176.

It is a happy number.

671866443 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 671866443 - 2⁴ = 671866427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (671866483) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30493 + ... + 47681.

It is an arithmetic number, because the mean of its divisors is an integer number (41788890).

Almost surely, 2^671866443 is an apocalyptic number.

671866443 is a deficient number, since it is larger than the sum of its proper divisors (331066917).

671866443 is a wasteful number, since it uses less digits than its factorization.

671866443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17339 (or 17336 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 671866443 is about 25920.3866290609. The cubic root of 671866443 is about 875.8457968078.

The spelling of 671866443 in words is "six hundred seventy-one million, eight hundred sixty-six thousand, four hundred forty-three".