671914647641 has 2 divisors, whose sum is σ = 671914647642. Its totient is φ = 671914647640.

The previous prime is 671914647589. The next prime is 671914647667. The reversal of 671914647641 is 146746419176.

It is a happy number.

671914647641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 671914647616 + 25 = 819704^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 671914647641 - 2⁶ = 671914647577 is a prime.

It is not a weakly prime, because it can be changed into another prime (671914644641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335957323820 + 335957323821.

It is an arithmetic number, because the mean of its divisors is an integer number (335957323821).

Almost surely, 2^671914647641 is an apocalyptic number.

It is an amenable number.

671914647641 is a deficient number, since it is larger than the sum of its proper divisors (1).

671914647641 is an equidigital number, since it uses as much as digits as its factorization.

671914647641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 56.

The spelling of 671914647641 in words is "six hundred seventy-one billion, nine hundred fourteen million, six hundred forty-seven thousand, six hundred forty-one".