6404695666 has 8 divisors (see below), whose sum is σ = 9916948224. Its totient is φ = 3099046260.

The previous prime is 6404695639. The next prime is 6404695681. The reversal of 6404695666 is 6665964046.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51650710 + ... + 51650833.

It is an arithmetic number, because the mean of its divisors is an integer number (1239618528).

Almost surely, 2^6404695666 is an apocalyptic number.

6404695666 is a deficient number, since it is larger than the sum of its proper divisors (3512252558).

6404695666 is a wasteful number, since it uses less digits than its factorization.

6404695666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103301576.

The product of its (nonzero) digits is 5598720, while the sum is 52.

The square root of 6404695666 is about 80029.3425313491. The cubic root of 6404695666 is about 1857.0894922502.

The spelling of 6404695666 in words is "six billion, four hundred four million, six hundred ninety-five thousand, six hundred sixty-six".