6666699 has 16 divisors (see below), whose sum is σ = 9632000. Its totient is φ = 4077216.

The previous prime is 6666689. The next prime is 6666719. The reversal of 6666699 is 9966666.

It is not a de Polignac number, because 6666699 - 2⁴ = 6666683 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7332 + ... + 8190.

It is an arithmetic number, because the mean of its divisors is an integer number (602000).

Almost surely, 2^6666699 is an apocalyptic number.

6666699 is a deficient number, since it is larger than the sum of its proper divisors (2965301).

6666699 is a wasteful number, since it uses less digits than its factorization.

6666699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074.

The product of its digits is 629856, while the sum is 48.

The square root of 6666699 is about 2581.9951587871. The cubic root of 6666699 is about 188.2075100440.

The spelling of 6666699 in words is "six million, six hundred sixty-six thousand, six hundred ninety-nine".