6666909 has 8 divisors (see below), whose sum is σ = 8977632. Its totient is φ = 4400400.

The previous prime is 6666883. The next prime is 6666931. The reversal of 6666909 is 9096666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6666909 - 2¹² = 6662813 is a prime.

It is a super-2 number, since 2×6666909² = 88895351228562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10699 + ... + 11304.

It is an arithmetic number, because the mean of its divisors is an integer number (1122204).

Almost surely, 2^6666909 is an apocalyptic number.

It is an amenable number.

6666909 is a deficient number, since it is larger than the sum of its proper divisors (2310723).

6666909 is a wasteful number, since it uses less digits than its factorization.

6666909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22107.

The product of its (nonzero) digits is 104976, while the sum is 42.

The square root of 6666909 is about 2582.0358246934. The cubic root of 6666909 is about 188.2094861926.

The spelling of 6666909 in words is "six million, six hundred sixty-six thousand, nine hundred nine".