670555309 has 2 divisors, whose sum is σ = 670555310. Its totient is φ = 670555308.

The previous prime is 670555307. The next prime is 670555343. The reversal of 670555309 is 903555076.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 627652809 + 42902500 = 25053^2 + 6550^2 .

It is a cyclic number.

It is not a de Polignac number, because 670555309 - 2¹ = 670555307 is a prime.

Together with 670555307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (670555307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335277654 + 335277655.

It is an arithmetic number, because the mean of its divisors is an integer number (335277655).

Almost surely, 2^670555309 is an apocalyptic number.

It is an amenable number.

670555309 is a deficient number, since it is larger than the sum of its proper divisors (1).

670555309 is an equidigital number, since it uses as much as digits as its factorization.

670555309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141750, while the sum is 40.

The square root of 670555309 is about 25895.0827185394. The cubic root of 670555309 is about 875.2756939147.

The spelling of 670555309 in words is "six hundred seventy million, five hundred fifty-five thousand, three hundred nine".