670210661 has 2 divisors, whose sum is σ = 670210662. Its totient is φ = 670210660.

The previous prime is 670210633. The next prime is 670210663. The reversal of 670210661 is 166012076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 534488161 + 135722500 = 23119^2 + 11650^2 .

It is a cyclic number.

It is not a de Polignac number, because 670210661 - 2²² = 666016357 is a prime.

Together with 670210663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (670210663) 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, 335105330 + 335105331.

It is an arithmetic number, because the mean of its divisors is an integer number (335105331).

Almost surely, 2^670210661 is an apocalyptic number.

It is an amenable number.

670210661 is a deficient number, since it is larger than the sum of its proper divisors (1).

670210661 is an equidigital number, since it uses as much as digits as its factorization.

670210661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 670210661 is about 25888.4271635030. The cubic root of 670210661 is about 875.1257118972.

The spelling of 670210661 in words is "six hundred seventy million, two hundred ten thousand, six hundred sixty-one".