6666977 has 2 divisors, whose sum is σ = 6666978. Its totient is φ = 6666976.

The previous prime is 6666949. The next prime is 6666991. The reversal of 6666977 is 7796666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5837056 + 829921 = 2416^2 + 911^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666977 - 2¹² = 6662881 is a prime.

It is not a weakly prime, because it can be changed into another prime (6666937) 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, 3333488 + 3333489.

It is an arithmetic number, because the mean of its divisors is an integer number (3333489).

Almost surely, 2^6666977 is an apocalyptic number.

It is an amenable number.

6666977 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666977 is an equidigital number, since it uses as much as digits as its factorization.

6666977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 47.

The square root of 6666977 is about 2582.0489925639. The cubic root of 6666977 is about 188.2101260794.

The spelling of 6666977 in words is "six million, six hundred sixty-six thousand, nine hundred seventy-seven".