6666663406 has 16 divisors (see below), whose sum is σ = 10972420704. Its totient is φ = 3018865824.

The previous prime is 6666663401. The next prime is 6666663431. The reversal of 6666663406 is 6043666666.

It is a self number, because there is not a number n which added to its sum of digits gives 6666663406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666663401) 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, 2417586 + ... + 2420341.

It is an arithmetic number, because the mean of its divisors is an integer number (685776294).

Almost surely, 2^6666663406 is an apocalyptic number.

6666663406 is a deficient number, since it is larger than the sum of its proper divisors (4305757298).

6666663406 is a wasteful number, since it uses less digits than its factorization.

6666663406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4837995.

The product of its (nonzero) digits is 3359232, while the sum is 49.

The square root of 6666663406 is about 81649.6381253463. The cubic root of 6666663406 is about 1882.0717509215.

The spelling of 6666663406 in words is "six billion, six hundred sixty-six million, six hundred sixty-three thousand, four hundred six".