6679661 has 2 divisors, whose sum is σ = 6679662. Its totient is φ = 6679660.

The previous prime is 6679639. The next prime is 6679667. The reversal of 6679661 is 1669766.

6679661 is digitally balanced in base 3, 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., 5851561 + 828100 = 2419^2 + 910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6679661 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 (6679667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3339830 + 3339831.

It is an arithmetic number, because the mean of its divisors is an integer number (3339831).

Almost surely, 2^6679661 is an apocalyptic number.

It is an amenable number.

6679661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6679661 is an equidigital number, since it uses as much as digits as its factorization.

6679661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 41.

The square root of 6679661 is about 2584.5040143130. The cubic root of 6679661 is about 188.3294077723.

The spelling of 6679661 in words is "six million, six hundred seventy-nine thousand, six hundred sixty-one".