671749245289 has 2 divisors, whose sum is σ = 671749245290. Its totient is φ = 671749245288.

The previous prime is 671749245287. The next prime is 671749245319. The reversal of 671749245289 is 982542947176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 655006955625 + 16742289664 = 809325^2 + 129392^2 .

It is a cyclic number.

It is not a de Polignac number, because 671749245289 - 2¹ = 671749245287 is a prime.

Together with 671749245287, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 671749245289.

It is not a weakly prime, because it can be changed into another prime (671749245287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335874622644 + 335874622645.

It is an arithmetic number, because the mean of its divisors is an integer number (335874622645).

Almost surely, 2^671749245289 is an apocalyptic number.

It is an amenable number.

671749245289 is a deficient number, since it is larger than the sum of its proper divisors (1).

671749245289 is an equidigital number, since it uses as much as digits as its factorization.

671749245289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60963840, while the sum is 64.

The spelling of 671749245289 in words is "six hundred seventy-one billion, seven hundred forty-nine million, two hundred forty-five thousand, two hundred eighty-nine".