6670661 has 2 divisors, whose sum is σ = 6670662. Its totient is φ = 6670660.

The previous prime is 6670649. The next prime is 6670687. The reversal of 6670661 is 1660766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6280036 + 390625 = 2506^2 + 625^2 .

It is a cyclic number.

It is not a de Polignac number, because 6670661 - 2¹⁸ = 6408517 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6672661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3335330 + 3335331.

It is an arithmetic number, because the mean of its divisors is an integer number (3335331).

Almost surely, 2^6670661 is an apocalyptic number.

It is an amenable number.

6670661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6670661 is an equidigital number, since it uses as much as digits as its factorization.

6670661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 6670661 is about 2582.7622809697. The cubic root of 6670661 is about 188.2447863875.

The spelling of 6670661 in words is "six million, six hundred seventy thousand, six hundred sixty-one".