666823845 has 8 divisors (see below), whose sum is σ = 1066918176. Its totient is φ = 355639376.

The previous prime is 666823813. The next prime is 666823847. The reversal of 666823845 is 548328666.

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 666823845 - 2⁵ = 666823813 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 666823794 and 666823803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666823847) by changing a digit.

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, 22227447 + ... + 22227476.

It is an arithmetic number, because the mean of its divisors is an integer number (133364772).

Almost surely, 2^666823845 is an apocalyptic number.

It is an amenable number.

666823845 is a deficient number, since it is larger than the sum of its proper divisors (400094331).

666823845 is a wasteful number, since it uses less digits than its factorization.

666823845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44454931.

The product of its digits is 1658880, while the sum is 48.

The square root of 666823845 is about 25822.9325406701. The cubic root of 666823845 is about 873.6491133023.

The spelling of 666823845 in words is "six hundred sixty-six million, eight hundred twenty-three thousand, eight hundred forty-five".