671594851813813 has 2 divisors, whose sum is σ = 671594851813814. Its totient is φ = 671594851813812.

The previous prime is 671594851813811. The next prime is 671594851813909. The reversal of 671594851813813 is 318318158495176.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 663461272938564 + 8133578875249 = 25757742^2 + 2851943^2 .

It is a cyclic number.

It is not a de Polignac number, because 671594851813813 - 2¹ = 671594851813811 is a prime.

Together with 671594851813811, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671594851813811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335797425906906 + 335797425906907.

It is an arithmetic number, because the mean of its divisors is an integer number (335797425906907).

Almost surely, 2^{671594851813813} is an apocalyptic number.

It is an amenable number.

671594851813813 is a deficient number, since it is larger than the sum of its proper divisors (1).

671594851813813 is an equidigital number, since it uses as much as digits as its factorization.

671594851813813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174182400, while the sum is 70.

The spelling of 671594851813813 in words is "six hundred seventy-one trillion, five hundred ninety-four billion, eight hundred fifty-one million, eight hundred thirteen thousand, eight hundred thirteen".