666848665 has 8 divisors (see below), whose sum is σ = 914535360. Its totient is φ = 457267632.

The previous prime is 666848639. The next prime is 666848671. The reversal of 666848665 is 566848666.

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

It is a cyclic number.

It is not a de Polignac number, because 666848665 - 2⁷ = 666848537 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9526375 + ... + 9526444.

It is an arithmetic number, because the mean of its divisors is an integer number (114316920).

Almost surely, 2^666848665 is an apocalyptic number.

It is an amenable number.

666848665 is a deficient number, since it is larger than the sum of its proper divisors (247686695).

666848665 is a wasteful number, since it uses less digits than its factorization.

666848665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19052831.

The product of its digits is 9953280, while the sum is 55.

The square root of 666848665 is about 25823.4131167822. The cubic root of 666848665 is about 873.6599525977.

Subtracting from 666848665 its reverse (566848666), we obtain a palindrome (99999999).

The spelling of 666848665 in words is "six hundred sixty-six million, eight hundred forty-eight thousand, six hundred sixty-five".