671666343 has 4 divisors (see below), whose sum is σ = 895555128. Its totient is φ = 447777560.

The previous prime is 671666327. The next prime is 671666351. The reversal of 671666343 is 343666176.

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

It is a cyclic number.

It is not a de Polignac number, because 671666343 - 2⁴ = 671666327 is a prime.

It is a super-2 number, since 2×671666343² = 902271352637987298, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 671666295 and 671666304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671666323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111944388 + ... + 111944393.

It is an arithmetic number, because the mean of its divisors is an integer number (223888782).

Almost surely, 2^671666343 is an apocalyptic number.

671666343 is a deficient number, since it is larger than the sum of its proper divisors (223888785).

671666343 is a wasteful number, since it uses less digits than its factorization.

671666343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223888784.

The product of its digits is 326592, while the sum is 42.

The square root of 671666343 is about 25916.5264454942. The cubic root of 671666343 is about 875.7588379846.

The spelling of 671666343 in words is "six hundred seventy-one million, six hundred sixty-six thousand, three hundred forty-three".