6666589 has 2 divisors, whose sum is σ = 6666590. Its totient is φ = 6666588.

The previous prime is 6666577. The next prime is 6666593. The reversal of 6666589 is 9856666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6200100 + 466489 = 2490^2 + 683^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666589 - 2¹⁷ = 6535517 is a prime.

6666589 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6666509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333294 + 3333295.

It is an arithmetic number, because the mean of its divisors is an integer number (3333295).

Almost surely, 2^6666589 is an apocalyptic number.

It is an amenable number.

6666589 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666589 is an equidigital number, since it uses as much as digits as its factorization.

6666589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 46.

The square root of 6666589 is about 2581.9738573425. The cubic root of 6666589 is about 188.2064749021.

The spelling of 6666589 in words is "six million, six hundred sixty-six thousand, five hundred eighty-nine".