671914647589 has 2 divisors, whose sum is σ = 671914647590. Its totient is φ = 671914647588.

The previous prime is 671914647583. The next prime is 671914647641. The reversal of 671914647589 is 985746419176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 633082792225 + 38831855364 = 795665^2 + 197058^2 .

It is a cyclic number.

It is not a de Polignac number, because 671914647589 - 2²¹ = 671912550437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671914647583) 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 as a sum of consecutive naturals, namely, 335957323794 + 335957323795.

It is an arithmetic number, because the mean of its divisors is an integer number (335957323795).

Almost surely, 2^671914647589 is an apocalyptic number.

It is an amenable number.

671914647589 is a deficient number, since it is larger than the sum of its proper divisors (1).

671914647589 is an equidigital number, since it uses as much as digits as its factorization.

671914647589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 91445760, while the sum is 67.

The spelling of 671914647589 in words is "six hundred seventy-one billion, nine hundred fourteen million, six hundred forty-seven thousand, five hundred eighty-nine".