666668769 has 8 divisors (see below), whose sum is σ = 957268032. Its totient is φ = 410257680.

The previous prime is 666668767. The next prime is 666668851. The reversal of 666668769 is 967866666.

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

It is not a de Polignac number, because 666668769 - 2¹ = 666668767 is a prime.

It is a super-2 number, since 2×666668769² = 888894495119950722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666668767) by changing a digit.

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, 8546997 + ... + 8547074.

It is an arithmetic number, because the mean of its divisors is an integer number (119658504).

Almost surely, 2^666668769 is an apocalyptic number.

It is an amenable number.

666668769 is a deficient number, since it is larger than the sum of its proper divisors (290599263).

666668769 is a wasteful number, since it uses less digits than its factorization.

666668769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17094087.

The product of its digits is 23514624, while the sum is 60.

The square root of 666668769 is about 25819.9296861940. The cubic root of 666668769 is about 873.5813830140.

The spelling of 666668769 in words is "six hundred sixty-six million, six hundred sixty-eight thousand, seven hundred sixty-nine".