671605601 has 2 divisors, whose sum is σ = 671605602. Its totient is φ = 671605600.

The previous prime is 671605579. The next prime is 671605603. The reversal of 671605601 is 106506176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 340365601 + 331240000 = 18449^2 + 18200^2 .

It is a cyclic number.

It is not a de Polignac number, because 671605601 - 2¹⁸ = 671343457 is a prime.

It is a Sophie Germain prime.

Together with 671605603, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (671605603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335802800 + 335802801.

It is an arithmetic number, because the mean of its divisors is an integer number (335802801).

Almost surely, 2^671605601 is an apocalyptic number.

It is an amenable number.

671605601 is a deficient number, since it is larger than the sum of its proper divisors (1).

671605601 is an equidigital number, since it uses as much as digits as its factorization.

671605601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 671605601 is about 25915.3545412753. The cubic root of 671605601 is about 875.7324375019.

The spelling of 671605601 in words is "six hundred seventy-one million, six hundred five thousand, six hundred one".