6706666 has 4 divisors (see below), whose sum is σ = 10060002. Its totient is φ = 3353332.

The previous prime is 6706631. The next prime is 6706669. The reversal of 6706666 is 6666076.

6706666 = T₂₁₁₃ + T₂₁₁₄ + T₂₁₁₅.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6175225 + 531441 = 2485^2 + 729^2 .

It is an Ulam number.

6706666 is a modest number, since divided by 6666 gives 670 as remainder.

It is not an unprimeable number, because it can be changed into a prime (6706669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1676665 + ... + 1676668.

Almost surely, 2^6706666 is an apocalyptic number.

6706666 is the 2115-th centered triangular number.

6706666 is a deficient number, since it is larger than the sum of its proper divisors (3353336).

6706666 is a wasteful number, since it uses less digits than its factorization.

6706666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3353335.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 6706666 is about 2589.7231512268. The cubic root of 6706666 is about 188.5828636098.

The spelling of 6706666 in words is "six million, seven hundred six thousand, six hundred sixty-six".