6666667406 has 16 divisors (see below), whose sum is σ = 11461516416. Its totient is φ = 2848907256.

The previous prime is 6666667393. The next prime is 6666667429. The reversal of 6666667406 is 6047666666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 681296 + ... + 691011.

It is an arithmetic number, because the mean of its divisors is an integer number (716344776).

Almost surely, 2^6666667406 is an apocalyptic number.

6666667406 is a deficient number, since it is larger than the sum of its proper divisors (4794849010).

6666667406 is a wasteful number, since it uses less digits than its factorization.

6666667406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372663.

The product of its (nonzero) digits is 7838208, while the sum is 53.

The square root of 6666667406 is about 81649.6626202460. The cubic root of 6666667406 is about 1882.0721273360.

The spelling of 6666667406 in words is "six billion, six hundred sixty-six million, six hundred sixty-seven thousand, four hundred six".