671543218 has 4 divisors (see below), whose sum is σ = 1007314830. Its totient is φ = 335771608.

The previous prime is 671543183. The next prime is 671543219. The reversal of 671543218 is 812345176.

671543218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 581919129 + 89624089 = 24123^2 + 9467^2 .

It is not an unprimeable number, because it can be changed into a prime (671543219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167885803 + ... + 167885806.

Almost surely, 2^671543218 is an apocalyptic number.

671543218 is a deficient number, since it is larger than the sum of its proper divisors (335771612).

671543218 is a wasteful number, since it uses less digits than its factorization.

671543218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335771611.

The product of its digits is 40320, while the sum is 37.

The square root of 671543218 is about 25914.1509218419. The cubic root of 671543218 is about 875.7053221294.

The spelling of 671543218 in words is "six hundred seventy-one million, five hundred forty-three thousand, two hundred eighteen".