6656489 has 4 divisors (see below), whose sum is σ = 7607424. Its totient is φ = 5705556.

The previous prime is 6656483. The next prime is 6656497. The reversal of 6656489 is 9846566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9846566 = 2 ⋅4923283.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6656489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6656483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 475457 + ... + 475470.

It is an arithmetic number, because the mean of its divisors is an integer number (1901856).

Almost surely, 2^6656489 is an apocalyptic number.

It is an amenable number.

6656489 is a deficient number, since it is larger than the sum of its proper divisors (950935).

6656489 is an equidigital number, since it uses as much as digits as its factorization.

6656489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950934.

The product of its digits is 311040, while the sum is 44.

The square root of 6656489 is about 2580.0172480044. The cubic root of 6656489 is about 188.1113814860. Note that the first 3 decimals are identical.

The spelling of 6656489 in words is "six million, six hundred fifty-six thousand, four hundred eighty-nine".