6666487 has 2 divisors, whose sum is σ = 6666488.
Its totient is φ = 6666486.
The previous prime is 6666479. The next prime is 6666509. The reversal of 6666487 is 7846666.
6666487 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 6666487 - 23 = 6666479 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (6666437) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333243 + 3333244.
It is an arithmetic number, because the mean of its divisors is an integer number (3333244).
Almost surely, 26666487 is an apocalyptic number.
6666487 is a deficient number, since it is larger than the sum of its proper divisors (1).
6666487 is an equidigital number, since it uses as much as digits as its factorization.
6666487 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 290304, while the sum is 43.
The square root of 6666487 is about 2581.9541049368.
The cubic root of 6666487 is about 188.2055150330.
The spelling of 6666487 in words is "six million, six hundred sixty-six thousand, four hundred eighty-seven".