671564471741 has 2 divisors, whose sum is σ = 671564471742. Its totient is φ = 671564471740.

The previous prime is 671564471729. The next prime is 671564471779. The reversal of 671564471741 is 147174465176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 349542270841 + 322022200900 = 591221^2 + 567470^2 .

It is a cyclic number.

It is not a de Polignac number, because 671564471741 - 2¹⁸ = 671564209597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671564471341) 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 as a sum of consecutive naturals, namely, 335782235870 + 335782235871.

It is an arithmetic number, because the mean of its divisors is an integer number (335782235871).

Almost surely, 2^671564471741 is an apocalyptic number.

It is an amenable number.

671564471741 is a deficient number, since it is larger than the sum of its proper divisors (1).

671564471741 is an equidigital number, since it uses as much as digits as its factorization.

671564471741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3951360, while the sum is 53.

The spelling of 671564471741 in words is "six hundred seventy-one billion, five hundred sixty-four million, four hundred seventy-one thousand, seven hundred forty-one".