671321018047 has 4 divisors (see below), whose sum is σ = 687694701456. Its totient is φ = 654947334640.

The previous prime is 671321018003. The next prime is 671321018083. The reversal of 671321018047 is 740810123176.

It is a happy number.

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 671321018047 - 2⁷ = 671321017919 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 (671321018087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8186841643 + ... + 8186841724.

It is an arithmetic number, because the mean of its divisors is an integer number (171923675364).

Almost surely, 2^671321018047 is an apocalyptic number.

671321018047 is a deficient number, since it is larger than the sum of its proper divisors (16373683409).

671321018047 is a wasteful number, since it uses less digits than its factorization.

671321018047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16373683408.

The product of its (nonzero) digits is 56448, while the sum is 40.

The spelling of 671321018047 in words is "six hundred seventy-one billion, three hundred twenty-one million, eighteen thousand, forty-seven".