666671889 has 8 divisors (see below), whose sum is σ = 957272512. Its totient is φ = 410259600.

The previous prime is 666671879. The next prime is 666671891. The reversal of 666671889 is 988176666.

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

It is not a de Polignac number, because 666671889 - 2⁹ = 666671377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666671869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8547037 + ... + 8547114.

It is an arithmetic number, because the mean of its divisors is an integer number (119659064).

Almost surely, 2^666671889 is an apocalyptic number.

It is an amenable number.

666671889 is a deficient number, since it is larger than the sum of its proper divisors (290600623).

666671889 is a wasteful number, since it uses less digits than its factorization.

666671889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17094167.

The product of its digits is 5225472, while the sum is 57.

The square root of 666671889 is about 25819.9901045682. The cubic root of 666671889 is about 873.5827457945.

The spelling of 666671889 in words is "six hundred sixty-six million, six hundred seventy-one thousand, eight hundred eighty-nine".