6424778666 has 8 divisors (see below), whose sum is σ = 9645908544. Its totient is φ = 3209475820.

The previous prime is 6424778629. The next prime is 6424778681. The reversal of 6424778666 is 6668774246.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1454000 + ... + 1458411.

It is an arithmetic number, because the mean of its divisors is an integer number (1205738568).

Almost surely, 2^6424778666 is an apocalyptic number.

6424778666 is a deficient number, since it is larger than the sum of its proper divisors (3221129878).

6424778666 is a wasteful number, since it uses less digits than its factorization.

6424778666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2913516.

The product of its digits is 16257024, while the sum is 56.

The square root of 6424778666 is about 80154.7170539576. The cubic root of 6424778666 is about 1859.0285390284.

The spelling of 6424778666 in words is "six billion, four hundred twenty-four million, seven hundred seventy-eight thousand, six hundred sixty-six".