671345018543 has 4 divisors (see below), whose sum is σ = 673279730760. Its totient is φ = 669410306328.

The previous prime is 671345018537. The next prime is 671345018549. The reversal of 671345018543 is 345810543176.

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

It is an interprime number because it is at equal distance from previous prime (671345018537) and next prime (671345018549).

It is a cyclic number.

It is not a de Polignac number, because 671345018543 - 2⁸ = 671345018287 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 (671345018549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 967355588 + ... + 967356281.

It is an arithmetic number, because the mean of its divisors is an integer number (168319932690).

Almost surely, 2^671345018543 is an apocalyptic number.

671345018543 is a deficient number, since it is larger than the sum of its proper divisors (1934712217).

671345018543 is a wasteful number, since it uses less digits than its factorization.

671345018543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1934712216.

The product of its (nonzero) digits is 1209600, while the sum is 47.

The spelling of 671345018543 in words is "six hundred seventy-one billion, three hundred forty-five million, eighteen thousand, five hundred forty-three".