6668778606 has 16 divisors (see below), whose sum is σ = 15242922624. Its totient is φ = 1905365304.

The previous prime is 6668778577. The next prime is 6668778619. The reversal of 6668778606 is 6068778666.

It is a self number, because there is not a number n which added to its sum of digits gives 6668778606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79390180 + ... + 79390263.

It is an arithmetic number, because the mean of its divisors is an integer number (952682664).

Almost surely, 2^6668778606 is an apocalyptic number.

6668778606 is an abundant number, since it is smaller than the sum of its proper divisors (8574144018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6668778606 is a wasteful number, since it uses less digits than its factorization.

6668778606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158780455.

The product of its (nonzero) digits is 24385536, while the sum is 60.

The square root of 6668778606 is about 81662.5900030118. The cubic root of 6668778606 is about 1882.2707778796.

Adding to 6668778606 its sum of digits (60), we get a palindrome (6668778666).

The spelling of 6668778606 in words is "six billion, six hundred sixty-eight million, seven hundred seventy-eight thousand, six hundred six".