671749249289 has 2 divisors, whose sum is σ = 671749249290. Its totient is φ = 671749249288.

The previous prime is 671749249183. The next prime is 671749249307. The reversal of 671749249289 is 982942947176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 653200171264 + 18549078025 = 808208^2 + 136195^2 .

It is a cyclic number.

It is not a de Polignac number, because 671749249289 - 2²⁰ = 671748200713 is a prime.

It is not a weakly prime, because it can be changed into another prime (671749245289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335874624644 + 335874624645.

It is an arithmetic number, because the mean of its divisors is an integer number (335874624645).

Almost surely, 2^671749249289 is an apocalyptic number.

It is an amenable number.

671749249289 is a deficient number, since it is larger than the sum of its proper divisors (1).

671749249289 is an equidigital number, since it uses as much as digits as its factorization.

671749249289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 109734912, while the sum is 68.

The spelling of 671749249289 in words is "six hundred seventy-one billion, seven hundred forty-nine million, two hundred forty-nine thousand, two hundred eighty-nine".