6665789 has 8 divisors (see below), whose sum is σ = 7556640. Its totient is φ = 5828976.

The previous prime is 6665777. The next prime is 6665797. The reversal of 6665789 is 9875666.

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 6665789 - 2⁴ = 6665773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665719) 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, 13247 + ... + 13740.

It is an arithmetic number, because the mean of its divisors is an integer number (944580).

Almost surely, 2^6665789 is an apocalyptic number.

It is an amenable number.

6665789 is a deficient number, since it is larger than the sum of its proper divisors (890851).

6665789 is a wasteful number, since it uses less digits than its factorization.

6665789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27019.

The product of its digits is 544320, while the sum is 47.

The square root of 6665789 is about 2581.8189324583. The cubic root of 6665789 is about 188.1989462542.

The spelling of 6665789 in words is "six million, six hundred sixty-five thousand, seven hundred eighty-nine".