666648843 has 16 divisors (see below), whose sum is σ = 1022578176. Its totient is φ = 378417600.

The previous prime is 666648793. The next prime is 666648881. The reversal of 666648843 is 348846666.

It is a happy number.

It is not a de Polignac number, because 666648843 - 2⁹ = 666648331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666648043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101946 + ... + 108287.

It is an arithmetic number, because the mean of its divisors is an integer number (63911136).

Almost surely, 2^666648843 is an apocalyptic number.

666648843 is a deficient number, since it is larger than the sum of its proper divisors (355929333).

666648843 is a wasteful number, since it uses less digits than its factorization.

666648843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210394.

The product of its digits is 3981312, while the sum is 51.

The square root of 666648843 is about 25819.5438185883. The cubic root of 666648843 is about 873.5726794634.

The spelling of 666648843 in words is "six hundred sixty-six million, six hundred forty-eight thousand, eight hundred forty-three".