671855342771 has 4 divisors (see below), whose sum is σ = 671938367712. Its totient is φ = 671772317832.

The previous prime is 671855342749. The next prime is 671855342791. The reversal of 671855342771 is 177243558176.

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 671855342771 - 2⁶ = 671855342707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671855342731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41500331 + ... + 41516516.

It is an arithmetic number, because the mean of its divisors is an integer number (167984591928).

Almost surely, 2^671855342771 is an apocalyptic number.

671855342771 is a deficient number, since it is larger than the sum of its proper divisors (83024941).

671855342771 is an equidigital number, since it uses as much as digits as its factorization.

671855342771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83024940.

The product of its digits is 9878400, while the sum is 56.

The spelling of 671855342771 in words is "six hundred seventy-one billion, eight hundred fifty-five million, three hundred forty-two thousand, seven hundred seventy-one".