6659977 has 2 divisors, whose sum is σ = 6659978. Its totient is φ = 6659976.

The previous prime is 6659957. The next prime is 6660011. The reversal of 6659977 is 7799566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6405961 + 254016 = 2531^2 + 504^2 .

It is a cyclic number.

It is not a de Polignac number, because 6659977 - 2¹¹ = 6657929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6659977.

It is not a weakly prime, because it can be changed into another prime (6659957) 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, 3329988 + 3329989.

It is an arithmetic number, because the mean of its divisors is an integer number (3329989).

Almost surely, 2^6659977 is an apocalyptic number.

It is an amenable number.

6659977 is a deficient number, since it is larger than the sum of its proper divisors (1).

6659977 is an equidigital number, since it uses as much as digits as its factorization.

6659977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 714420, while the sum is 49.

The square root of 6659977 is about 2580.6931239495. The cubic root of 6659977 is about 188.1442325345.

The spelling of 6659977 in words is "six million, six hundred fifty-nine thousand, nine hundred seventy-seven".