6666499 has 24 divisors (see below), whose sum is σ = 8421408. Its totient is φ = 5241600.

The previous prime is 6666487. The next prime is 6666509. The reversal of 6666499 is 9946666.

It is not a de Polignac number, because 6666499 - 2⁵ = 6666467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6666449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44074 + ... + 44224.

It is an arithmetic number, because the mean of its divisors is an integer number (350892).

Almost surely, 2^6666499 is an apocalyptic number.

6666499 is a deficient number, since it is larger than the sum of its proper divisors (1754909).

6666499 is a wasteful number, since it uses less digits than its factorization.

6666499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235 (or 228 counting only the distinct ones).

The product of its digits is 419904, while the sum is 46.

The square root of 6666499 is about 2581.9564287571. The cubic root of 6666499 is about 188.2056279592.

The spelling of 6666499 in words is "six million, six hundred sixty-six thousand, four hundred ninety-nine".